Less visible to people, though the way gsm works means that every call and text you receive entails a lookup to your number's original provider. Prefix allocati

Less visible to people, though the way gsm works means that every call and text you receive entails a lookup to your number's original provider. Prefix allocations to mobile networks are static and they are required to return a new route if you've ported. Which means if a company leaves the market, someone has to take on their allocations or even non-current customers will lose connectivity. Or at least that was true last time a checked, 4 or so years ago. Kind of crazy.