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Is a T-Mobile SIM required to root?

I have an unlocked MT3G that I use on AT&T and I want to root it. When I first got the phone I know that I had to use my roommates TM sim to activate the phone. Since the phone is unlocked, do I need to do that again or can I just enter the APN info for AT&T to activate it?

[Q] Unlocking HTC inspire from AT&T no unlock prompt?

Hi everyone. I received the unlock code from AT&T and after I insert my non AT&T sim card and boot the phone up, I don't get the network unlock prompt. I get "sim not provisioned mm #2" how do I get the unlock prompt to come back up? I was rooted and running CM 7, but flashed it back to a the non rooted HTC stock rom from HTC's website. Any help/ideas are appreciated!

Are you SIM unlocked or bootloader unlocked? How did you root?

bananagranola said:
Are you SIM unlocked or bootloader unlocked? How did you root?
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I'm sorry, I don't understand the difference between SIM unlocked & bootloader unlocked, I just want it unlocked so it can be used on different carriers. AT&T has already given me the code to use.
When I rooted, I used aahk, but when I put the stock HTC rom back, I lost root access.

Are you still S-Off? Which carrier's SIM are you trying to use? Some carriers lock their SIM cards, so only SIM unlocking the phone doesn't work.

bananagranola said:
Are you still S-Off? Which carrier's SIM are you trying to use? Some carriers lock their SIM cards, so only SIM unlocking the phone doesn't work.
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Yes, s-off and I tried a verizon and a tracphone SIM
also tried a red pocket SIM and t-mobile SIM. I get the "sim not provisioned MM #2" message. No prompt

shannonmarie11 said:
Yes, s-off and I tried a verizon and a tracphone SIM
also tried a red pocket SIM and t-mobile SIM. I get the "sim not provisioned MM #2" message. No prompt
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Click to collapse
Since you used the aahk and are still soff than you already have Sim unlock. Not all carriers and Sims play nice with unlocked phones. Sometimes a different Sim will do the trick.
Example when I had unlocked my iPhone way back in the day (original) it would not work using my sisters tmo Sim but it would on my brothers tmo sim
Sent from my Nexus 4 using xda app-developers app

Sim not provisioned mm#2 usually means the Sim card hasn't been activated, if the phone was Sim locked you would be prompted for the unlock code. Sounds like you're ready to go
Sent from my Desire HD using xda app-developers app

ATT sim lock problem

Actually have ATT A9(CID is BS-US001) with unlocked bootloader , root and s-off. after flashing unlocked ROM 1.57.617.52 still ask me for unlock code when i insert anouther sim. with ATT sim work properly. never see that before. Need your ideas. in getprop [gsm.network.type]: [Unknown]. so may be need to cnange gsm.version.baseband????
Thank in advise!

You have to get an unlock code from AT&T and unlock it yourself. Flashing a rom isn't going to sim unlock your phone.

creusset said:
You have to get an unlock code from AT&T and unlock it yourself. Flashing a rom isn't going to sim unlock your phone.
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Is unlocked ROM means unlocked GSM like Google play edition for M7? wich one ROM give me unlocked (sim free) phone?

UAALEX said:
Is unlocked ROM means unlocked GSM like Google play edition for M7? wich one ROM give me unlocked (sim free) phone?
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There's no rom that unlocks your phone. Call att and request an unlock code.

creusset said:
There's no rom that unlocks your phone. Call att and request an unlock code.
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Click to collapse
i have an unlock code but...... the phone not accepted it. may be need brick it totally and then flash it. i am s-off.

Ahhh I thought you were trying to unlock the phone by flashing a rom lol. All you need to do is go back to any stock rom you want and then put the non ATT Sim in, use the unlock code, and then flash whatever other rom you want

I just unlocked my Sprint HTC U11

I am about to port this line over to at&t, is there anything special I need to do to get data working correctly when I put the new att sim in? I'm asking because I have heard of data issues when using the sprint u11 on at&t. Phone is sim unlocked with the stock sprint rom.

Nevermind, looks like its an att issue.

S-off and flash to US Unlocked firmware. That *may* help.

Unlocking Sprint based S8 after changed firmware to T-mobile.

Hey there,
I got a S8 phone from a coworker, that belonged to their ex. It was locked to their ex's google account. She gave it to me and said I could have it if I could get it to work.
Ended up flashing it with the T-mobile S8 firmware but only to find out that it was unlocked to the Sprint network. She is no longer on his plan so could not call Sprint to unlock it. And she doesn't want to call him to deal with it. Anyway, so no problem. Can unlock it via a 3rd party. Went with unlock base but still waiting for the code.
From what I read on the site, I will need to insert my sim and it will ask me for the unlock code. Unfortunately, when I insert a sim currently, it just says to contact sprint. I'm guessing this is due to the T-mobile firmware.
Will I now have to install the Sprint firmware to get it give me the unlock prompt upon sim insertion?
And after it's unlocked, can I go back to the T-mobile firmware?
Thanks for all the help in advance!

If the IMEI is paid off you can request an unlock from Sprint, if not you would need to use third party.
You can attempt unlock yourself but you do it at your own risk.