Quick update - got this working by making sure the SIM works fine in a normal phone and then placing it in the board and running it off external power. Definitely looked like a power issue, but has since disappeared.
Thanks, guys!
Quick update - got this working by making sure the SIM works fine in a normal phone and then placing it in the board and running it off external power. Definitely looked like a power issue, but has since disappeared.
Thanks, guys!