12-21-2017 07:01 AM
Sorry, I'm a bit confused. Aren't you perhaps referring to the SIM card? I don't think changing SD card has something to do with changing Carriers. But changing SIM card does.
As soon as you switched Carrier, you need to get a new SIM card from them and have it activated so you can go ahead and use their service.
01-04-2018 02:24 PM
I finally got my pone number transfered to my new carrier, but I now have a new question: How do I verify it through the phone?
Sorry for the delay. It actually depends since it is a Carrier-related concern, you may check it with your Carrier. For some, it can be found through Settings > Sim cards. - Ella