T-Mobile
Recently, T-Mobile has made network upgrade. Most of the older phone models and international phones including 2G and 3G will not work at all. Please check your phone compatibility here.
Enter IMEI in the link below. Dial *#06# to get your phone's IMEI.
https://www.t-mobile.com/resources/bring-your-own-phone
https://www.t-mobile.com/resources/bring-your-own-phone