S3 and switching cell networks

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http://forum.xda-developers.com – Ok so I live in a border city where America is right across the water so sometimes picking up a AT&T signal is not too difficult Also I work for one of the Canadian carriers here and I have heard this complaint quite often and I am wondering if it is android issue or maybe a signal strength issue Here's what's happening. When actually crossing over from Canada into the United States people myself included are not picking up AT&T after arriving, instead I am faced with zero signal at all. The only way I get signal is to basically manually choose AT&T and this did not happen befo (HowTos)