Can't I switch service providers with a rooted phone? - Android Q&A, Help & Troubleshooting

I have a Samsung note 3 that was originally from Sprint and a Samsung galaxy 5 that was with At&T. I rooted both these phones thinking that I'd be able to use them on T-Mobile then, but when I put T-Mobile sim cards in them at the store they didn't work. Is there something else I have to do?

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:victory:

I'm trying to use my Sprint sim card in my Verizon Samsung Galaxy s9 plus

And it says Sprint card is not from Verizon.I thought Verizon devices we're unlocked? What do I need to do to get my Sprint service to work in the Verizon s9 plus? Thanks
It also keeps saying that the Sim card has locked.but I'm getting 3G data now.

Is it possible to use unlocked ATT branded Galaxy S9+ on T-Mobile?

Hello,
My wife's Galaxy Note 8 somehow boots to different firmware based on SIM card inserted into it which surprised me since I thought that phones are usually coming with single firmware for either provider. I'm considering switching to T-Mobile from ATT and I have ATT branded Galaxy S9+ unlocked. My question will it have the same experience I noticed on my wife's phone or I have to deal with flashing firmware etc to make it work properly with WiFI calling etc features of native T-Mobile ROM?
Below message I received from Ebay seller which sold Galaxy Note 8. Is it true?
Thanks for contacting us. Samsung integrated new firmwares on S8 and newer model phones. Means whatever sim card you insert, it will program according to it. If you insert T-Mobile sim card, phone will restart and will show T-Mobile logo and apps. Same for AT&T and other GSM carriers. If you are AT&T user. Please insert the AT&T sim card and phone will ask you to restart the device with AT&T logo and apps. Tap yes.
artisticcheese said:
Hello,
My wife's Galaxy Note 8 somehow boots to different firmware based on SIM card inserted into it which surprised me since I thought that phones are usually coming with single firmware for either provider. I'm considering switching to T-Mobile from ATT and I have ATT branded Galaxy S9+ unlocked. My question will it have the same experience I noticed on my wife's phone or I have to deal with flashing firmware etc to make it work properly with WiFI calling etc features of native T-Mobile ROM?
Below message I received from Ebay seller which sold Galaxy Note 8. Is it true?
Thanks for contacting us. Samsung integrated new firmwares on S8 and newer model phones. Means whatever sim card you insert, it will program according to it. If you insert T-Mobile sim card, phone will restart and will show T-Mobile logo and apps. Same for AT&T and other GSM carriers. If you are AT&T user. Please insert the AT&T sim card and phone will ask you to restart the device with AT&T logo and apps. Tap yes.
Click to expand...
Click to collapse
Yes. It will work on any carrier. Even vzw or Sprint
Sent from my SM-G965U1 using Tapatalk
If unlocked ATT branded GS9+ phone will work on any other carrier, what is the point of the threads below about flashing T-Mobile CSC (or whatever it's called) to ATT phone and vice a versa, etc if phone already supports switching between carriers on it's own?

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