said by Gone: said by Guspaz:
Does the phone think it's on TELUS (and show that as the network) when it's in the US? I mean, unless AT&T's towers are advertising themselves as TELUS, I don't see how this could be a problem.
It has nothing to do with AT&T and everything to do with how Telus' PRL treats AT&T.
As I own a Telus phone and have been to the US multiple times with it, I can say with certainty that the phone will display that it is on AT&T once it gets out of Telus range and into AT&T's towers and will warn you multiple times that if you use data at that point, you will be subject to roaming fees.
I had celluar data turned off and had no surprises on my bill when I returned to Canada (I only used the phone on wifi hotspots and wifi networks)
The next time I hit the US, I intend to buy a T-Mobile SIM and sign up for a per day data package while I'm there.