Just noticed a problem with my iPad after coming back from an overseas trip. I was using a Telecom SIM card in the US, with data roaming turned off, and connected to AT&T. I wasn't able to connect to Telecom 3G data after arriving back in NZ. After some poking around, I noticed that the APN was mysteriously missing from the cellular data settings (internet.telecom.co.nz). Re-entry of this setting followed by a re-start fixed the problem.

Anyone else come across this, and more importantly, know how to make the APN setting stick?

David.