Anyone had any battery improvement after flashing the unlocked f/w to their Verizon devices? Haven't found a central thread for it, so hey.
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Hey folks. I'm really tempted to get the T-Mobile S4, have it unlocked so I can take it to AT&T but I know at some point I'll be doing custom roms and probably radio upgrades since they come out once in a while. But will doing any of that break the SIM unlock? The one I fear most is probably radio upgrades but I've never moved a phone to another carrier so don't know all of the implications. Roms I doubt will be an issue but anyone know or have previous experience? At worse I have to keep calling T-Mobile to get it unlocked again if radio upgrades mess it up but I'd rather not be calling them all the time and if it is a problem then maybe I need to rethink this a bit more.
No, when you unlock it, it will be permanently unlocked, even you restore to stock rom, flash any other rom, radios, recovery or anything to OS or software related.
Before you flash a rom, make sure to try it in another provider with the factory/stock version, so you can make sure that the phone is working fine since the beginning,
T-Mobile S4 (SGH-M919) has a lot to offer in connectivity such as LTE Bands 1/2/4/5/7/17; in HSPA+/UMTS: 850/AWS/1900/2100MHz and finally GSM: 850/900/1800/1900MHz, so it surely will work on the AT&T network.
While the AT&T S4 (SGH-I337) only has LTE: Bands 1/4/7/17; HSPA+/UMTS: 850/1900/2100MHz; GSM: 850/900/1800/1900MHz.
For unlocking your T-Mobile S4, here is the link to the new T-Mobile Unlocking Policies: http://support.t-mobile.com/docs/DOC-1588. I bought my new S4 recently and they declined to unlock it before the first 40 days (postpaid) and before the first 60 days (prepaid) and there are certain other requirements to comply.
Lucky for me I found a trick on this forum to unlock it without the subsidy code (since my requests were rejected), it worked flawlessly and even I restore or flash any stock or custom rom, the unlocked state stays permanently because it's based on the NV system, just don't mess up with the NV base system.
If you want a phone with full LTE bands coverage, go for the M919 and it's bootloader unlocked from factory unlike the AT&T version which is bootloader locked. So, you can't go wrong with this model.
In terms of performance, the international version I9500 (without LTE support) is faster than any other S4 with SnapDragon 600 processor, I tested it myself since I have both I9500 and M919, the I9500 is octa-core (4-core of 1.6, and 4-core of 1.2) but only 4-cores work at the same time, in order to have a better power management, but even works in 1.6, it's a little bit faster than the 1.9 from SD600, i noticed on the graphics performance too.
And custom roms and other mods will come thru time for this specific model, just be patience, I have my M919 working with a non-US carrier sim card and installed custom rom Wicked v2 and it's working fast and stable.
I hope this info help you to decide!
Cheers!
Screwbal said:
Hey folks. I'm really tempted to get the T-Mobile S4, have it unlocked so I can take it to AT&T but I know at some point I'll be doing custom roms and probably radio upgrades since they come out once in a while. But will doing any of that break the SIM unlock? The one I fear most is probably radio upgrades but I've never moved a phone to another carrier so don't know all of the implications. Roms I doubt will be an issue but anyone know or have previous experience? At worse I have to keep calling T-Mobile to get it unlocked again if radio upgrades mess it up but I'd rather not be calling them all the time and if it is a problem then maybe I need to rethink this a bit more.
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Click to collapse
I bought an unlocked AT&T i747 in the U.S. and gave it to my sister in Germany, where she uses it on the O2 network. It's still on the 4.1.x AT&T stock ROM, and I want to upgrade it to 4.3, but have a few question for you S III experts:
1) Should I use the official AT&T MJB ROM, or one of the Rogers/Bell/Telus MK5 ROMs? (keep in mind that I need none of the carrier specific stuff, I just want the best 4.3 stock ROM for the i747)
2) It is unclear to me what difference the new 4.3 bootloader makes. Do I need o flash it, or am I better off leaving the bootloader unchanged? I understand one cannot go back once on the 4.3 bootloader, but I don't understand what advantages the new bootloader brings.
Any advice is greatly appreciated. I am still in Germany for a few days before returning to the U.S., and would love to perform the upgrade while I'm here.
Also, battery life is of utmost importance, so if upgrading to 4.3 is known to have any negative impact in this regard, please let me know.
Thanks!
-J
Anyone? Anyone? Bueller? Bueller?
Hi just purchased a used Verizon m8 and i did the s-off and installed a few custom ROMs but I get dropped and weak signal every now and then. Just wondering what the best radio to use for telus/koodo. Thanks.
I am on cm 12.1 great ROM. My radio 1.12.23.1211
vhicke said:
Hi just purchased a used Verizon m8 and i did the s-off and installed a few custom ROMs but I get dropped and weak signal every now and then. Just wondering what the best radio to use for telus/koodo. Thanks.
I am on cm 12.1 great ROM. My radio 1.12.23.1211
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Click to collapse
You did no research. You shouldn't have bought that phone.
Verizon is cdma. Telus is GSM.
I'm on Telus as well using WWE/International firmware.
Telus/koodo and bell in Canada are also a CDMA/gsm company. This phone should have no problems with telus/koodo. How is the wwe firmware do you see a difference in signal. Is your phone root and are you using any custom ROMs.
vhicke said:
Telus/koodo and bell in Canada are also a CDMA/gsm company. This phone should have no problems with telus/koodo. How is the wwe firmware do you see a difference in signal. Is your phone root and are you using any custom ROMs.
Click to expand...
Click to collapse
Click this link, and scroll down to "So can I use my Android device on other networks?" (Actually you should read the whole article. It's quite informative.)
I'll quote the second paragraph from there for you here:
First off, if you have a CDMA handset (the lack of a SIM card is a sure fire indicator) from Bell/Virgin or TELUS/Koodo (that isn't a world phone) or from the US (Sprint/Verizon), it is impossible to use the phone on a Canadian network other than the one it came from as Bell and TELUS does not allow the import CDMA devices from outside their network.
I'll say it again, you didn't do proper research. If you would have bought a GSM phone, you wouldn't be having this issue.
The link also has a chart that shows the compatible carriers for the different bands/frequencies that are available.
Hey guys, so it's been a while since I've had a decent phone. My last was an M7 that was S-off, unlocked, and had a custom rom.
It's been a year or so since I've been in the scene, and I'd like some tips. Mainly because I'm seeing stuff left and right about
firmware on the M9, and so I don't want to flash anything before knowing what's what. I have a At&T unlocked M9 and my software version is 1.32.502.9. Running Android 5.0.2 Any info on Firmware, Rom requirements would be greatly appreciated. I'm good on
unlocking the boot loader and rooting. Thanks!
Please read the ReadMe thread for general information and the opening post of the thread of the rom that you want to use for specific information.
I have an AT&T model I'd like to get on 8.x. I'm not on AT&T but on a regional gsm carrier in Arizona. I'd love a stock rom that doesn't have any AT&T customizations but the bootloader looks to be an issue. Is there a 8.x official rom or other way to upgrade phone?
Thanks
not as of yet i get my replacement unit today in the mail and will post with an update it i can flash the retail version over to my at&t moto z2
Any luck?
Bumping this thread, would love to see if any progress has been made here.
Any update if you can flash retail OREO on AT&T version?
i bricked out my AT&T device trying to get it to change the CID to a tmo cid and in the process killed the device since i have had it replaced and I am trying again just hope it works this time