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Originally Posted by andy
I thought the system described recently was just to keep roamers on the roamed network in question, not falsely charge people whose phones select another.
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When you read it the first time that's how they want it to sound but if you go back and read it again and think about how GSM registration and authentication works you have to ask just how this system is going to keep a phone from switching to another carrier. If your phone decides to search for and authenticate on a new network, the old network has no way of reaching out and dragging it back. The only thing I can think they would be doing is to falsely claim that your phone came back on its own. Now, we already know that many roamed carriers don't send the deregistration messages the way they should when you turn your phone off. It's not too big of a step to claiming that you are still roaming when you are not. If you know any reason why this will not work, please let me know.