I'm sorry you're having problems. I'm on T-Mobile and it's working fine. Another user said they were using AT&T
in this post. I was helping him to troubleshoot a GPS problem at the time. Read a couple of the post exchanges between myself and that user, they never complained about AT&T cellular service not working at all. That user's post is what I based my information on.
Out of curiosity, I just now searched for and found AT&T's IMEI compatibility checker and the MIAD01 was not compatible. I think Cricket may also have an IMEI compatibility checker as well.
https://www.att.com/buy/byod/identify?devicetype=phone
I will edit my previous post and remove AT&T as a compatible cellular service.