Unlocked Samsung Galaxy S3 Won't Connect To Network - T-Mobile, Samsung Galaxy SIII

As the title states, I decided to fork out 20$ on an unlock code for my SGH-T999L. The unlock went smoothly, but I can't connect to any networks for some reason, whether I use my inactive AT&T SIM or my active MetroPCS SIM.
When I set my phone to auto-select the network, it tells me that my SIM doesn't support the network it picks. When I search for networks, I get T-Mobile, AT&T and "311660" on both SIM cards, which neither of them will connect to. I'm sure it has nothing to do with APN settings, as those are solely for MMS and Data if I recall correctly.
Any ideas?

Were you using it with metro before the unlock?
Sent from my SGH-M919 using Tapatalk

Related

[Q] NO SERVICE messages. Please Help!

Hi All,
I have a Canadian T989D from Koodo mobile which I unlocked using unlock code. I took it abroad to Pakistan and after using for 6 months, one day all of a sudden I got NO SERVICE.
Trying to manually select networks, I come across different networks available but clicking on any one of them results in NETWORK REGISTERED sign but still doesn't connect to any network. When I go into the APN settings, I can see different APN settings for the respective sim cards that I put in. E.g. If I put UFONE sim card in, I can see APN settings for UFONE SERVICE PROVIDER.
Here is the twist though. I came back to Canada yesterday and when I put any Canadian Sim in it (FIDO/VIRGIN), it connects to the network without any problems.
Next, I tried T-Mobile sim in the phone. At first few attempts I would receive NO SERVICE/EMERGENCY CALLS ONLY messages. However, just recently I was able to connect to the network by repeatedly changing sim cards and restarting the phone.
So the specific questions to all of you is that "Why can't I connect to ANY network in PAKISTAN when I can see the APN settings for each sim card I put in?" Is there something I can do to fix the issue? I have a running sim card from PAKISTAN with me which I had previously used to connect to the network. Please help/guide me.
Any response will be greatly appreciated.

Authentication error trying to tether when unlocked

I have a network unlocked ATT LG G4and I am on mobile share plan that allows tethering. I have no problem tethering in the US with my ATT SIM card.
However, when I use another SIM card (for data in europe), I get a message "authentication was unsuccessful" when trying to activate the hotspot.
If I put the same SIM into my galaxy S4, have no problem activating the hotspot and tethering.
Any idea what's going on? Clearly the foreign SIM is fine. And the phone is capable of tethering (on ATT).
I posted this under ATT G4 as well, but I'm not sure if it's particular to ATT.

connect to other network providers?

im obviously on tmobile
and at my work i have barely any service there but a coworker has verizone and has pretty good service
in the settings app under mobile networks there is the Network Operators i click search now and it searches for a network
AT&T and Verizon usually pop up
i try to connect to one of those and it say unable to connect try again later or unable to select network select automatically
anyone know the problem here? do i need to be unlocked? is it the apn settings? do i need to turn on data roaming?
thanks
No one?
Sent from my SM-G925T using Tapatalk
You have a T Mobile Sim card and will only connect to T Mobile towers.
You would need to swap and activate an AT&T Sim card to connect to AT&T.
Verizon is CDMA so very different network.
martinezma99 said:
You have a T Mobile Sim card and will only connect to T Mobile towers.
You would need to swap and activate an AT&T Sim card to connect to AT&T.
Verizon is CDMA so very different network.
Click to expand...
Click to collapse
then why would that even be a setting and have it try connecting to towers

Phone Stuck Showing "Searching / No Service"

Hello all. I purchased a edge+ today but whenever I insert a sim, the phone stays on searching. I made sure that I rebooted the device and I also tried re-seating the sim many times. I believe the device is unlocked and the imei/esn is in clean standing with T-Mobile. I tried a MetroPCS sim card and it stayed on searching, same thing happened with a Verizon sim. However when I inserted the T-Mobile sim, it sometimes says no service but ever since I rebooted the device, it stays on "searching" no matter which sim is installed. I find this whole ordeal frustrating since the signal bars show up for the MetroPCS and T-Mobile sim but with Verizon nothing happens. Any help would be greatly appreciated.
Yours is G928T? If yes, it does not support Verizon/Sprint even if it's unlocked.
Did you buy it off of Craigslist/Ebay? It might be blacklisted. checkesnfree.com
knite75 said:
Yours is G928T? If yes, it does not support Verizon/Sprint even if it's unlocked.
Did you buy it off of Craigslist/Ebay? It might be blacklisted. checkesnfree.com
Click to expand...
Click to collapse
Yes, it's the G928T but it's not blacklisted I checked. The simcards I was using on the phone were old ones(no longer in service) I thought they would work. I used a scissor to cut my WORKING sim and placed it in the phone and it took the MetroPCS sim. Everything works fine now except calls and text only work with WiFi Calling on. If I turn off WiFi, I can't text or make calls(not on registered network) but if I turn the WiFi back on, it works fine. Any suggestions?
MetroPCS and T-Mobile are on the same network.
Check/add MetroPCS APN.
Setting -> Mobile Networks -> Access Point Names
Add MetroPCS APN if it's not there.
gazasalim said:
Yes, it's the G928T but it's not blacklisted I checked. The simcards I was using on the phone were old ones(no longer in service) I thought they would work. I used a scissor to cut my WORKING sim and placed it in the phone and it took the MetroPCS sim. Everything works fine now except calls and text only work with WiFi Calling on. If I turn off WiFi, I can't text or make calls(not on registered network) but if I turn the WiFi back on, it works fine. Any suggestions?
Click to expand...
Click to collapse
knite75 said:
MetroPCS and T-Mobile are on the same network.
Check/add MetroPCS APN.
Setting -> Mobile Networks -> Access Point Names
Add MetroPCS APN if it's not there.
Click to expand...
Click to collapse
Yeah I know they are which baffles me as to why it isn't working. I tried adding a custom APN but same thing happens. I get calls/sms on WiFi but if I turn it off I get "No Service"
Just go to metro and get a new Sim. You could have damaged it by cutting it. It should be free. ATT gives me then free all the time. Usually, the phone will just auto update the apn settings when a specific carriers Sim is inserted
Sent from my SM-G928T using Tapatalk
erick161 said:
Just go to metro and get a new Sim. You could have damaged it by cutting it. It should be free. ATT gives me then free all the time. Usually, the phone will just auto update the apn settings when a specific carriers Sim is inserted
Sent from my SM-G928T using Tapatalk
Click to expand...
Click to collapse
I went and it turns out the device is blacklisted. This whole time I was rolling with the imei in the phone, after checking last night, I noticed that the imei on the back of the device differs from the one that's actually on the software. I was able to get in touch with the seller and he's coming back to give me my money back. Guess a mod can mark this thread closed.

Need help connecting to AT&T network after unlocking VZW g6

I unlocked my VZW g6 play by entering code in settings section to unlock phone (did not insert AT&T sim and wait for code request). It said code accepted but when I put in my AT&T sim I can't connect to their LTE network. It reads the sim, switches to global (gsm), and my network says AT&T with the proper phone number for that sim... But no 4g. I tried inputting the APN settings I found on several sites.. No luck. Same when I copied the APN settings from another AT&T prepaid phone I had available. No go. I called and asked for the APN settings from AT&T and they said I need to change the IMEI number on my sim to that of my g6. They said they did that for me. After power cycling the phone as instructed I still have no data service. Anybody have an idea what settings I need to use in order to use my AT&T sim? Or is that even my problem?

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