IPhone 3G stuck on T-Mobile Network and no service!

Question

I am on Rogers in Canada and live on the border with the US and always pickup the US towers. When I pickup AT&T towers, my phone works as usual but every now and then it picks up a t-mobile and when it does, the phone because useless. Now it could be that Apple blocks ALL non AT&T networks but now they didn't think about all those Canadians or International users that would visit the US and cannot force their phone any network.
Problem is, when I go to the Carrier option in Settings, it either keeps searching and then crashes and reboots or gives an error message "Unable to load network list"
Calling Rogers did nothing because they mentioned that a few customers had this problem and the only thing they can do is block roaming on my phone which doesn't fly with me because I travel there quite frequently.
Network bars go up and down until it crashes and reboots again. Very weird.
I can't believe that Apple did not think of this one.
BTW, its still happening after the 2.02 update. Although I did notice a huge improvement in reception after the update on the Rogers Network.

Answer 1

Yes, that kind of tallies with my experience ... after 3 days of useless iPhone 3G (BTW, killing 3G on the phone and relying on acquiring AT&T 2G didn't help, it still locked onto T-Mobile with the result that it was draining battery and rebooting frequently!), I ended up visiting the local Apple Store.
Although the visit was not to resolve the iPhone problem, whilst there I happened to cycle the phone and due to the store having a local AT&T cell, the strength of the local signal meant that I finally re-acquired a AT&T 3G signal ... once locked on again the phone was fine for the next day.
Nett outcome of this is that I would prefer to lay most of the blame for this debacle on the poor state of 3G support both by AT&T (and US carriers in general), maybe exacerbated in my case by two related events (the local DNC in Denver, which saturated local AT&T cells including 3G and a proliferation of v2.0.0 and v2.0.1 firmwares on iPhones in town, which dragged cell coverage into the weeds).
It would be nice for future sanity if AT&T and T-Mobile could at least resolve the ability to acquire/release the iPhone gracefully, otherwise I'll be very sceptical of travelling back to the US with only my iPhone, as a self-employeed consultant I can't afford to be out of touch for three days again!