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I thought that now every cellular provider actually does this so when you move between networks your IP address stays the same as otherwise all your connections

I thought that now every cellular provider actually does this so when you move between networks your IP address stays the same as otherwise all your connections would break during handover; and not breaking connections is basically mandatory since voice over LTE, because voice calls now run over IP protocol too and seamless handover for voice is expected by users.

vel0city 5y ago
You're usually pretty heavily NAT'ed on a cellular network. Your internal IP address probably doesn't change much but external IP addresses probably change a good bit. I am not a network guy at a cellular company, but IMO it would make more sense to use a more local gateway for outgoing connections rather than potentially routing things all the way across the country. These days people keep their number but move all over the country. It would be insane to have to route things back home every time.