My Xperia Ion has unlocked bootloader and installed this kernel.
I have used the Font Installer and installed an incompatible font and the phone restarted after it and went into bootloop (only sony and xperia logos were showing and the phone was restarting all the time...)
The first thing I did was soft reset (up+power for 5 seconds) but nothing changed so i did hard reset and the phone got bricked after with no led and vibrations, unable to connect to pc...
I put it into wall charger over night but nothing changed only there is the red led flashing when connected to the charger/PC ( 5 seconds red led, then 20 seconds no led and again and again)
I have tried Flashtool, PPC, fastboot and all the button combinations while connected to PC but nothing works, the phone is completely dead...
Does anybody know how to fix this issue?
Can you dissemble it? If it is decemble it and disconnect battery cable from motherboard and re connect it. After that try to connect to flashtool and flash stock firmware.
Sent from my LT28h using xda app-developers app
pharix said:
Can you dissemble it? If it is decemble it and disconnect battery cable from motherboard and re connect it. After that try to connect to flashtool and flash stock firmware.
Sent from my LT28h using xda app-developers app
Click to expand...
Click to collapse
I have opened the phone but am too afraid to go further. Have you yourself done it before? Is disconnecting of the battery the only way how to fix it?
I don't know is there is another way. I just telling you about my experience. I did it quite many times.
Sent from my LT28h using xda app-developers app
pharix said:
I don't know is there is another way. I just telling you about my experience. I did it quite many times.
Sent from my LT28h using xda app-developers app
Click to expand...
Click to collapse
Please can you tell me how to do so? I have removed the inner plastic cover already, I have uploaded a pic... Can you tell me how can I unplug the battery from the motherboard?
EDIT:
OK, I have figured it out myself, just unpluged the small curved cable with the white end coming from the battery and reconnected after few minutes... It seems the phone is now charging
boot loop due to incompatible font
installed a incompatible font installed with ifont it is in boot loop
what to do?
locked bootloader
but rooted with doomlord easy rooting toolkit r17
jelly bean 6.2.B.0.211
xperia ion LT28h
plzzzz help........
frostitomik said:
Please can you tell me how to do so? I have removed the inner plastic cover already, I have uploaded a pic... Can you tell me how can I unplug the battery from the motherboard?
EDIT:
OK, I have figured it out myself, just unpluged the small curved cable with the white end coming from the battery and reconnected after few minutes... It seems the phone is now charging
Click to expand...
Click to collapse
So, did it work, I mean unplugging the battery and putting it back??
II'm in the same position as you were, and so desperate abt it..
Im having the same problem
this happened to me aswell i installed a font and rebooted it without checking which ones were the defaults or not and it gave me a boot loop im desperate a swell.
Related
So yesterday i tried to flash a new kernel (nova kernel) using cwm and after attempting to reboot, all i felt was a vibration and then nothing happened. Is my xperia s bricked? and if so is there anything i can do?
What works:
1. Able to hold power button and feel the single vibration; however, the screen remains blank after that.
2. Able to soft reset and hard reset but it does nothing
3. Able to connect to pc in flash/fastboot mode
4. Able to flash kernels and firmware (flashed full stock .55 and wiped everything, still no progress)
What doesn't work:
1. Screen will not turn on no matter what i do
2. Phone will not charge (no led, no screen)
3. CANNOT ENTER CWM!
Any help is appreciated.
Sounds almost like you're battery is dead toss it on the charger in a situation like this it can take up to 5 hours for the phone to boot.
Sent from my LT28at using xda app-developers app
thanitos said:
Sounds almost like you're battery is dead toss it on the charger in a situation like this it can take up to 5 hours for the phone to boot.
Sent from my LT28at using xda app-developers app
Click to expand...
Click to collapse
that could be it...but i doubt it because when i flashed the kernel it was about 98% battery and i haven't been able to turn on the phone since. that plus i've left the phone charging for 8 hours last night, which ended again with no led and no screen...
i'll keep it plugged in though and see if anything happens
So does full ftf file with flashtool flash ok?
Sent from my Jellybean Xperia S
Ben36 said:
So does full ftf file with flashtool flash ok?
Sent from my Jellybean Xperia S
Click to expand...
Click to collapse
yeah, but after flashing i still can't boot. i can hold the power button and feel the vibration, but the screen remains off (no splash screen, no nothing)
Well I'm out of ideas ik a hard reset is suppose to be like taking out the battery but maybe it just needs to die
Sent from my LT28at using xda app-developers app
disc0nnector said:
yeah, but after flashing i still can't boot. i can hold the power button and feel the vibration, but the screen remains off (no splash screen, no nothing)
Click to expand...
Click to collapse
After you try to boot do you get any screen response? Like backlight or a quick blink. After turning on with no screen, does the pc recognize as usb drive or mtp device? I was just thinking maybe screen failure.
~Jaramie
Sent from my ION
ToledoJab said:
After you try to boot do you get any screen response? Like backlight or a quick blink. After turning on with no screen, does the pc recognize as usb drive or mtp device? I was just thinking maybe screen failure.
~Jaramie
Sent from my ION
Click to expand...
Click to collapse
when i try to boot, i only get the one vibration that signals the phone has turned on (or in my case attempted to turn on). i can keep pressing and holding the power button multiple times consecutively and still get the same result. it's like the phone turns on and then shuts down immediately.
i only get led notifications when i connect to the computer in fastboot or flash mode, other than that i get nothing.
Try reading through this ion softbrick recovery thread. There are tricks in the OP that users reported work.
~Jaramie
Sent from my ION
ToledoJab said:
Try reading through this ion softbrick recovery thread. There are tricks in the OP that users reported work.
~Jaramie
Sent from my ION
Click to expand...
Click to collapse
looked at that thread, nothing works. closest i came to something was plugging the phone into the wall for a while until the red led came on, but then it just turns off after 2-3 hours and i'm back to square one
Some have had to leave it plugged into charger for days. Then got green led, flashed and it started.
This is just one way these phones act goofy during soft brick. You just have to be patient, as all who have recovered have said.
kye71 said:
Well great news phone is back and running great
I had it plugged in for about 18 hours then the Red light came on.
24+ hours later the Red light was off. So I tried to flash, nothing. It was just a wasted attempted and I nothing happened.
Plugged it back in, ~2 hours later the Green light came on and I could press Power to have the Battery Screen come on.
Flashed it and it worked! Thanks for the support!
I'm not sure why the Red light went off. I'm thinking maybe the cord was bumped and the charger wasn't plugged in all the way?
Click to expand...
Click to collapse
Good luck
~Jaramie
Sent from my ION
ToledoJab said:
Some have had to leave it plugged into charger for days. Then got green led, flashed and it started.
This is just one way these phones act goofy during soft brick. You just have to be patient, as all who have recovered have said.
Good luck
~Jaramie
Sent from my ION
Click to expand...
Click to collapse
that's crazy,,,i don't think i'll have the patience to do that lol...
i've left it in for 13 hours, but still only the red led though. i'll keep it going and see what happens though
Maybe you should flash your xperia back to the stock ROM. You can do that using the official Sony flashtool: http://developer.sonymobile.com/201...ocked-xperia-smartphones-video-beta-download/ . Just watch the video and (hopefully) you will understand everything. After flashing back to stock ROM you can decide what you want to do with your phone afterwards
Hopefully this solves your problem!
Sent from my LT26i using xda app-developers app
xJokerz said:
Maybe you should flash your xperia back to the stock ROM. You can do that using the official Sony flashtool: http://developer.sonymobile.com/201...ocked-xperia-smartphones-video-beta-download/ . Just watch the video and (hopefully) you will understand everything. After flashing back to stock ROM you can decide what you want to do with your phone afterwards
Hopefully this solves your problem!
Sent from my LT26i using xda app-developers app
Click to expand...
Click to collapse
as stated in the op, i've already attempted this with no luck. it flashes but it won't boot, the screen won't even light up let alone show a sony logo
update - 19 hours so far...still only the red led!
really hope i don't have a $400 paperweight now...
disc0nnector said:
update - 19 hours so far...still only the red led!
really hope i don't have a $400 paperweight now...
Click to expand...
Click to collapse
I know this is difficult, but I have never read of anyone NOT recovering their phone.
If it helps their are others in similar situations
http://forum.xda-developers.com/showthread.php?p=35262472
~Jaramie
Sent from my ION
ToledoJab said:
I know this is difficult, but I have never read of anyone NOT recovering their phone.
If it helps their are others in similar situations
http://forum.xda-developers.com/showthread.php?p=35262472
~Jaramie
Sent from my ION
Click to expand...
Click to collapse
i tried one of the posted solutions, but in doing so i find that i can't even enter into fastboot/flash mode anymore, and i can't soft or hard reset. i only get the solid red led now when plugging into anything (pc, charger) and the phone is unresponsive to any of the buttons.
http://forum.xda-developers.com/showthread.php?t=1836219
i have this exact same problem in this thread, the highlight being that the screen doesn't turn on at all, while others have been able to get to the sony logo.
it seems that everyone that has this exact problem has not gotten any solution yet.
I have exactly the same issue
http://forum.xda-developers.com/showthread.php?t=2032017
SAT told me that the phone has been modificated and they didn¨t repair.
I think thas the phone doesnt charge the battery, and this may be the problema, who knows...I have a brink above my papers..
basafre said:
I have exactly the same issue
http://forum.xda-developers.com/showthread.php?t=2032017
SAT told me that the phone has been modificated and they didn¨t repair.
I think thas the phone doesnt charge the battery, and this may be the problema, who knows...I have a brink above my papers..
Click to expand...
Click to collapse
exactly, the other problem is that sus and pc companion both won't repair the phone because the bootloader is unlocked.
i've flashed the relock bootloader ftf and it still says the same thing which is weird.
UPDATE - 46 hours and still only the red led!
Hi guys,
I need your help. My brand new (2 weeks old!) Xperia Acro S bricked by itself!
I was browsing the web when the screen went completely black. I tried to do a hard reset (pressing power + volume up) because it worked many times before that (it was not the first time that the whole "black screen crash" happened), but the phone was completely dead.
The local Sony assistance told me (after keeping it for 6 weeks ) that they won't repair it because the phone is not currently sold in my country (I won it on Facebook).
As of now the only thing that is working is the charging light when I connect it to the charger.
The phone was absolutely and completely stock, NO rom, NO root whatsoever.
Please tell me that I did not win an extremely pricey paperweight!
Plug in charger,when it shows battery icon,press the power button until it is turn on
Sent from my LT28h using xda premium
Did you tried Power button + Volume down button? If not hold Power button + Volume down button for 10 seconds. It should work.
Double Post, sorry.
UchihaDareNial said:
Plug in charger,when it shows battery icon,press the power button until it is turn on
Sent from my LT28h using xda premium
Click to expand...
Click to collapse
The phone is not out of charge, it is completely dead. The only thing working is the LED notification light that turns red when connected to the charger.
pharix said:
Did you tried Power button + Volume down button? If not hold Power button + Volume down button for 10 seconds. It should work.
Click to expand...
Click to collapse
I tried every possible combination of HW buttons but to no avail...
Try Sony Update service. HERE is download link.
There have been some topics I think floating around that batteries have died at like 50%
Sent from my LT28at using xda app-developers app
thanitos said:
There have been some topics I think floating around that batteries have died at like 50%
Sent from my LT28at using xda app-developers app
Click to expand...
Click to collapse
The battery was the very first thing I checked, I charged it for about a day.
pharix said:
Try Sony Update service. HERE is download link.
Click to expand...
Click to collapse
Will it work even if the PC does not see the phone?
Sent from my XT910 using xda app-developers app
GMdV said:
The battery was the very first thing I checked, I charged it for about a day.
Will it work even if the PC does not see the phone?
Sent from my XT910 using xda app-developers app
Click to expand...
Click to collapse
It should work.
Sent from my LT28h using xda app-developers app
pharix said:
It should work.
Sent from my LT28h using xda app-developers app
Click to expand...
Click to collapse
Unfortunately it doesn't. I connected the phone while holding the volume down button pressed but nothing happened.
I have the same problem with xperis S.
It bricked by itself.
The only one noticeable thing i remember that when I last seen it a few minutes after it was working that the light was flashing blue and the black screen. After it it newer switched on.
Now while charging, the light turns solid red and nothing more. No flashmode. No fastboot mode. Tried to remove accu. It did not help. Sony update service and flashtool does not see the device.
There was stock firmware droid 4.0.4 and root. Nothing more. Everything worked fine. No updates were done before it bricked.
Is there any way out?
handwerk said:
I have the same problem with xperis S.
It bricked by itself.
The only one noticeable thing i remember that when I last seen it a few minutes after it was working that the light was flashing blue and the black screen. After it it newer switched on.
Now while charging, the light turns solid red and nothing more. No flashmode. No fastboot mode. Tried to remove accu. It did not help. Sony update service and flashtool does not see the device.
There was stock firmware droid 4.0.4 and root. Nothing more. Everything worked fine. No updates were done before it bricked.
Is there any way out?
Click to expand...
Click to collapse
Then I'm not the only one...
As of now there is no way out, you should contact your local sony assistance.
It would be great if you could tell us what was the cause of the death of your Xperia.
Your phone isn't dead... I had the same problem with my xperia s... when i plug in the carger, the red light lights on.. that means it's alive .. but not charging, it's charging when the led is orange.. i've waited 1 day for see the orange led.. I really don't know why.. :/
martinko23 said:
Your phone isn't dead... I had the same problem with my xperia s... when i plug in the carger, the red light lights on.. that means it's alive .. but not charging, it's charging when the led is orange.. i've waited 1 day for see the orange led.. I really don't know why.. :/
Click to expand...
Click to collapse
I got same problem, only red led, but pc see phone and flashtool say device connect with usb debugging off
For tricks on recovery from SOFT-brick use the link in my signature. Just read up first. Good luck
~Jaramie
sent by my ION
Xperia SOFT-BRICK Recovery Thread
ToledoJab said:
For tricks on recovery from SOFT-brick use the link in my signature. Just read up first. Good luck
~Jaramie
sent by my ION
Xperia SOFT-BRICK Recovery Thread
Click to expand...
Click to collapse
I try all of yor guide and nothing works, in next week a change battery and them try
martinko23 said:
Your phone isn't dead... I had the same problem with my xperia s... when i plug in the carger, the red light lights on.. that means it's alive .. but not charging, it's charging when the led is orange.. i've waited 1 day for see the orange led.. I really don't know why.. :/
Click to expand...
Click to collapse
And then what happened? Did you just turn it on and it worked?
It turned on by itself...
Come on baby light my fire ! Woo ! That's good ! :3
martinko23 said:
It turned on by itself...
Come on baby light my fire ! Woo ! That's good ! :3
Click to expand...
Click to collapse
Ok, great. Then I'll just let it charge and see what happens. Thanks!
Sent from my XT910 using xda app-developers app
No problem, i hope it will turn on..
Stop with jokes about Dubstep, Just drop it.
My Xperia Ion is stuck at Sony Logo when i switch it On.
Nothing responding.
I kept the battery to Drain and now i plugged it to wall charger i get a solid red led.
I checked all the threads related to soft/hard brick but seriously im confused big time. What should i do now ?
Now my phone has been charging for 30 minutes.
i dont know what happened , is it soft / hard brick ??
i tried to restore my cwm backup and it showed successful. And when i booted this happened.
The screen is Off sometimes and it turns on and shows SONY LOGO. what should i do ?
But when the screen is off the red led is on.
Please somebody help. I'm really panicking. i can't think properly.
Think you are on XZX. Am I right? Try reflashing the ROM.
pharix said:
Think you are on XZX. Am I right? Try reflashing the ROM.
Click to expand...
Click to collapse
No bro.You didnt get the picture. My phone is not booting. Its stuck on SONY logo .
I was on XZX2 v2. But i reflashed back to stock. then this happened
im not able to flash .
Use flashtools to flash a stock ftf making sure you choose the wipe options. Do not exclude anything.
Captain Droid said:
No bro.You didnt get the picture. My phone is not booting. Its stuck on SONY logo .
I was on XZX2 v2. But i reflashed back to stock. then this happened
im not able to flash .
Click to expand...
Click to collapse
Now I get it. I thought you can go to CWM. Sorry.
Spectre51 said:
Use flashtools to flash a stock ftf making sure you choose the wipe options. Do not exclude anything.
Click to expand...
Click to collapse
I can't get in to Flashboot option ( green led). When i connect the phone by pressing the Vol Down button the Led is RED and its solid.
The power button doesnt work, i mean i cant switch on the phone.
When its plugged to the wall charger , its solid red led and after sometime screen turn on itself and the SONY LOGO appears . thats it. I cant do anything else. Nothing responding.
Captain Droid said:
I can't get in to Flashboot option ( green led). When i connect the phone by pressing the Vol Down button the Led is RED and its solid.
The power button doesnt work, i mean i cant switch on the phone.
When its plugged to the wall charger , its solid red led and after sometime screen turn on itself and the SONY LOGO appears . thats it. I cant do anything else. Nothing responding.
Click to expand...
Click to collapse
can you get into fastboot mode?
using flashtool,
select fastboot mode
flash the stock kernel
remove and reset the phone
enter flash mode
then flash the stock ftf
happened to me once... this worked for me
Sent from my Xperia ion using xda premium
xyge said:
can you get into fastboot mode?
using flashtool,
select fastboot mode
flash the stock kernel
remove and reset the phone
enter flash mode
then flash the stock ftf
happened to me once... this worked for me
Sent from my Xperia ion using xda premium
Click to expand...
Click to collapse
A hard bricked phone won't do any thing no matter what is done. If a light or anything reacts then you have some level of soft brick.
Use the rubber band trick to flash back to stock.
The solid red led means low level charging. Low level charge is on until the battery level is enough to start kernel charging (battery icon screen)
When the red led goes out but before the phone turns on is the tiny time frame you have to enter flash mode. So you use a rubber band to hold volume down.
Read about the trick in my recovery thread in my signature.
From my Xperia LT28at ION
ToledoJab said:
A hard bricked phone won't do any thing no matter what is done. If a light or anything reacts then you have some level of soft brick.
Use the rubber band trick to flash back to stock.
The solid red led means low level charging. Low level charge is on until the battery level is enough to start kernel charging (battery icon screen)
When the red led goes out but before the phone turns on is the tiny time frame you have to enter flash mode. So you use a rubber band to hold volume down.
Read about the trick in my recovery thread in my signature.
From my Xperia LT28at ION
Click to expand...
Click to collapse
I kept the mobile connected to my pc with the rubber band trick, its been 8 hours now, still the Led is Solid RED.
Its not charging i think. flashtool did not detect the phone till now.
Captain Droid said:
I kept the mobile connected to my pc with the rubber band trick, its been 8 hours now, still the Led is Solid RED.
Its not charging i think. flashtool did not detect the phone till now.
Click to expand...
Click to collapse
Long time ago I faced a same problem. My phone stuck at RED light. I just dissemble the phone and disconnect battery cable from motherboard and reconnect the cable. Then I hold power button and volume + button until 3 vibrate. (10 second). Now the phone is off. After that I connect phone to computer while holding volume down button and flash stock ftf.
Give it a try.
pharix said:
Long time ago I faced a same problem. My phone stuck at RED light. I just dissemble the phone and disconnect battery cable from motherboard and reconnect the cable. Then I hold power button and volume + button until 3 vibrate. (10 second). Now the phone is off. After that I connect phone to computer while holding volume down button and flash stock ftf.
Give it a try.
Click to expand...
Click to collapse
That too i saw in one post. But i cant find any slots/screws to open and i don't have the right set of tools to open the phone.
right now im so mindf***ked. How to open the phone?
I have only one phone and i bricked that.
Edit: I found the screws, inside the two small covers on bottom and up right ? But i got no tools to open that screw
Captain Droid said:
That too i saw in one post. But i cant find any slots/screws to open and i don't have the right set of tools to open the phone.
right now im so mindf***ked. How to open the phone?
I have only one phone and i bricked that.
Edit: I found the screws, inside the two small covers on bottom and up right ? But i got no tools to open that screw
Click to expand...
Click to collapse
Which screw? Star Screw or Plus Screw? If you don't have screw driver you can open Plus screw using Knife and Star screw using Minus screw driver.
DO IT ON YOUR OWN RISK.
Click to expand...
Click to collapse
pharix said:
Which screw? Star Screw or Plus Screw? If you don't have screw driver you can open Plus screw using Knife and Star screw using Minus screw driver.
Click to expand...
Click to collapse
Yeah its STAR Screw. Approx 7-8 total adding both sides.
Im not gonna open it, anyways i'm giving the phone to service centre. i don't have time to wait for the battery to charge / Drain or anything.
Hope they can fix this in matter of hours.
For future reference, you will need a torx t6 ( or t5 cant remember exactly) for the star screws. The ion is easy to take apart, hope they fix yours.
Sent from my LT28h using xda app-developers app
there is a solution
hey im minda new here but not new to rooting n so on.... i was attempting to root my ion lt28i with the doomlord kernel and when i was to flash back stock kernel i accidentally flashed it to system lol (i was sleepy)... but when the phone got stuck on sony screen i came here and was told the battery had to drain b4 attemping another flash i left my phone for half a day it was still on i got fed up and pressed the camera vol -, vol + and power keys all at once then the screen turned off.... i think i may have stumbled on to the hard reset procedure so for those who are stuck on sony logo u can do the same it works i feflashed stock jb rom and rerooted not life is great and all ir right with the world :angel:
ps for battery drain issues install setCPU on rooted rom and turn down clock it saves a tonne of battery hope this helped
venom1553 said:
hey im minda new here but not new to rooting n so on.... i was attempting to root my ion lt28i with the doomlord kernel and when i was to flash back stock kernel i accidentally flashed it to system lol (i was sleepy)... but when the phone got stuck on sony screen i came here and was told the battery had to drain b4 attemping another flash i left my phone for half a day it was still on i got fed up and pressed the camera vol -, vol + and power keys all at once then the screen turned off.... i think i may have stumbled on to the hard reset procedure so for those who are stuck on sony logo u can do the same it works i feflashed stock jb rom and rerooted not life is great and all ir right with the world :angel:
ps for battery drain issues install setCPU on rooted rom and turn down clock it saves a tonne of battery hope this helped
Click to expand...
Click to collapse
What's the use of bumping the old thread?
Sent from my LT28h using XDA Premium 4 mobile app
UchihaDareNial said:
What's the use of bumping the old thread?
Sent from my LT28h using XDA Premium 4 mobile app
Click to expand...
Click to collapse
At least they are trying to help out in the q&a section to get the 10 posts.
Most new users just spam the forum with useless posts.
This thread has had its time.
For more help please check out the sticky threads.
Thread closed
I have this xperia ion which was running ICS smoothly till morning. I kept it using till the battery drained completely. After keeping it on charge for about 20 minutes when it failed to turn on. I searched the internet. It said
- I need to charge it for a long time till the green led flashes up.
-Might be soft bricked
Whenever I try to turn it on it vibrates and then nothing happens. A blank screen comes up with no logo( Xperia or Sony).
I tried updating it JB but only in vain. now it only shows the blank screen.
What to do? I found no answers to this.
vyomnod said:
I have this xperia ion which was running ICS smoothly till morning. I kept it using till the battery drained completely. After keeping it on charge for about 20 minutes when it failed to turn on. I searched the internet. It said
- I need to charge it for a long time till the green led flashes up.
-Might be soft bricked
Whenever I try to turn it on it vibrates and then nothing happens. A blank screen comes up with no logo( Xperia or Sony).
I tried updating it JB but only in vain. now it only shows the blank screen.
What to do? I found no answers to this.
Click to expand...
Click to collapse
It might sound unrelated, but did you use the original wire and charger?
Sent from my LT28h using xda app-developers app
lee480 said:
It might sound unrelated, but did you use the original wire and charger?
Sent from my LT28h using xda app-developers app
Click to expand...
Click to collapse
Yea i did tried with original ones and then when they gave nothing i tried with generic ones
my xperia ion has been bricked for a month and a half , i have let the battery die for 5 straight days , i plugged it in the charger and i waited one full night and i have gottent a constant led to black lit on and off led to constant and off and i have flashed the kernel from the stock ftf with flashmode via flashtool and put it back on the charger the next day the led was off so i flashed the whole stock rom and after that i unplugged the phone and hooked it back on the charger and as of now its on a red led and staying constant , did i fix the phone or not??? i need some help guys seriously a monthat and a half of this phone being off and soft bricked....... i havent been able to get into fastboot since the bootloader is locked but still not luck at all. idk what to do anymore.... i need more info or help or an alternative way and also i dont have the tools to fully take it apart and reset the battery connection cable so......yeah...
Wait, after u flash whole ftf and the led constantly turn red? and u have try to turn on the phone?
Or u can use sony pcc or seus. also try using another battery.. hope that will help u
Sent from my Xperia Miro using xda premium
I think u might have fixed it...wait and see if it boots up...
Sent from my Xperia ion using XDA Premium 4 mobile app