Anyone using 620 on T-Mobile?

[nfbsk]

Did you use a newer non-cut micro sim? My theory is that the sim I'm using now is too old. I have been using it for about 8 years or more.

 

[speedtouch]

Did you use a newer non-cut micro sim? My theory is that the sim I'm using now is too old. I have been using it for about 8 years or more.

I think you do need to use a new SIM. Mine is new and I sometimes get 3G and HSPA. As I understand it, the new SIMs allow you to connect to 3G/4G/LTE, whereas the old SIMs know nothing of those data frequencies. Get a new SIM and see what happens.