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[Q] Unlocked ATT device no signal after switching SIM

Hello.
I have an Atrix HD from ATT, I bought it unlocked at Ebay. I used it with my ATT sim Card, then with Movistar in Colombia for vacations and everything was working great. Then I came back to the US, used a T-Mobile sim card and now I can not use any other sim card. The only one it accepts is the T-Mobile one and it works fine. If I pop any other sim card it gives me no signal (a white cross appears in a red circle where the circle bars should be).
My phone is rooted but I have not flashed any ROM or done anything else beyond installing Superuser and Titanium Backup. I already did an internal and an external reset and none works: The only sim card that gets signal is the T-Mobile one. Called T-Mobile and they said they cant help me since the phone is not supported.
My hint is that somehow the T-Mobile sim card switched my frequency bands. Whats funny though is that now I am in Colombia and when I insert the T-Mobile sim card and check which network is my phone connected to it shows Movistar and the signal bars are great. If I pop up my Movistar sim card it gets no signal at all.
Any help will be greatly appreaciated.

You must have setup the sim card lock disable that and then try putting in another sim
Sent from my MB886 using xda app-developers app

tab s T705 LTE micro sim card problem

Has anyone had problems with LTE tab s 8.4" sim card ?
the signal bars all the time are full as if there is sim card in the device. i tried inserting two nano sim cards with micro adapter it immediately asks to restart as Sim card detected..
I place sim card, restart and NOTHING !
same full bar signal all the time with/without sim. Still says no sim card inserted.
Device from singapore.
Now i know 8.4 LTE tab S is 3g/4g sim card compatible and sim cards work perfectly otherwise. i reset factory settings with no results !
going to mobile networks trying to chose networks also gives error of no network available.
ANy ideas/ Help !
thank you

wrong section. moderator please delete.
Posted again in q&A section.
thank you

Check your imei number. If imei starts 00..... you have problem with logining to network.

atype007 said:
Has anyone had problems with LTE tab s 8.4" sim card ?
the signal bars all the time are full as if there is sim card in the device. i tried inserting two nano sim cards with micro adapter it immediately asks to restart as Sim card detected..
I place sim card, restart and NOTHING !
same full bar signal all the time with/without sim. Still says no sim card inserted.
Device from singapore.
Now i know 8.4 LTE tab S is 3g/4g sim card compatible and sim cards work perfectly otherwise. i reset factory settings with no results !
going to mobile networks trying to chose networks also gives error of no network available.
ANy ideas/ Help !
thank you
Click to expand...
Click to collapse
I have the same thing as well when no simcard is inserted. Per understanding, the phone automatically logs on to any network so you could dial the emergency number (in your country)

Unknown Sim Card Inserted

Hello,
I have LG g2 from verizon, It is unlocked all my sim cards were working on it.. now when i factory reset my mobile it is showing insert sim card when i insert it is showing you have inserted unknown sim card.. i tried my 2-3 sim cards same issue.. even i am seeing sim signals showing and sim pin code it is also asking and also sim data working but i cannot see home screen it does not process further please help me...

Network issues

Hello All,
I got OPO 3T before 2 weeks in India & I was using Jio 4G (VOLTE) and Vodafone as my mobile sim cards, both the sim cards were working properly for 10 days. i had to remove my vodafone sim from my mobile on day 10 due to my work schedules, and after rebooting the mobile the Jio sim network got vanished without any message or errors.
I had to travel to another country for my work where i had to change my sim cards, the new sim card which was inserted was working properly with data initially and i was using it for the whole day. I switched-off the data before i went to bed and to my surprise the sim card had the same problem "No service(Telikom)" when i checked it in the morning. I tried other network sim cards also but it is showing the same results, though the sim cards are working properly on other mobile phones.
In the Telikom sim i tried changing the APN settings as defined by the operator but without luck.
Any help would be appreciated. Thanks.

you need to set data on jio sim to get it working. if you change your data to another sim then jio network will be gone.

Dual SIM Note 8 Poor Network connection

I've got my phone setup with a Fido (Canada) data SIM and MTN (Nigeria) SIM for roaming in the second slot. I am using a sim adapter so a 128gb Samsung memory card is also hooked in. For some reason the MTN roaming SIM will not receive calls, most callers to that SIM card are told the number isn't available. However, if I switch off the second data SIM, the First SIM will then be able to receive calls without any problems. I've taken out the sim adapter and memory card, but this still persists.
Has anyone experienced this before or know a way to fix this?

gangsta101 said:
I've got my phone setup with a Fido (Canada) data SIM and MTN (Nigeria) SIM for roaming in the second slot. I am using a sim adapter so a 128gb Samsung memory card is also hooked in. For some reason the MTN roaming SIM will not receive calls, most callers to that SIM card are told the number isn't available. However, if I switch off the second data SIM, the First SIM will then be able to receive calls without any problems. I've taken out the sim adapter and memory card, but this still persists.
Has anyone experienced this before or know a way to fix this?
Click to expand...
Click to collapse
So the phone is not a dual-SIM phone, it is only with the "adapter"?

It is a dual SIM phone alright. These hybrid dual SIM can either take two SIM cards or one SIM card and a memory card. If you want all 3, then you need to use an adapter to achieve that.