E750 Mudi Not Registered on Metro by T-Mobile

Hi, I have a E750 and a Metro SIM card. When inserted into the unit, it gives me a list of APN’s, and I select fast.metropcs.com, but the status of the sim card is “not registered”.

Any ideas or things I can try to troubleshoot?

Did you active your SIM?

I found this one Activate Your Prepaid Phone Service | Metro® by T-Mobile

Do you need to activate as the above?

Sometimes, sim card too old, sometimes sim card too new