Yeah what DavidAdams says happens a lot when our UK (Vodafone) users travel. when set to auto, in theory the phone should jump on to the network which is partnered to the home network if it can see one but if another (non-partner) is a lot stronger and the phone is set to auto, it will jump to it.
We make sure our guys who travel have the link to the home carrier's pages about travelling, which lists the preferred network for all countries. For most UK carriers, those same pages show the user how to set most device into manual, so they can select the network. Frequent flyers have a hard copy of this info in their bag so they don't get stuck.
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