Since he already changed the pin on his SIM
The Mobley update can only mess the timer function on the Mobley etc..
His SIM will still be useable in whichever new hotspot he gets
My 815s is still working great, I'm using it right now
Although it seems to bog down at night and I switch over using my phone hot spot, I think it is the local AT&T tower getting too much traffic at night, so I switch to the Verizon phone
I can explain it to you.
But I Can Not understand it for you !
....
Connected using T-Mobile Home internet and Visible Phone service
1997 F53 Bounder 36s