scrap pad

seamless gsm+wifi cell networking

T-Mobile is offering phones & service that switch between using GSM and wifi for phone service (via). cool but expensive. only works with two specific (new?) phones.

UMA service treats trusted Wi-Fi networks as just more GSM cell transceivers. This requires new handsets that have both Wi-Fi and GSM radios, and which can operate both radios simultaneously to allow a seamless handoff between GSM and Wi-Fi (in either direction), just as cell networks hand off between two transceivers. “This is GSM over Wi-Fi,” said T-Mobile spokesperson Tom Harlin.

(from Wi-Fi Networking News: T-Mobile Takes Cell/Wi-Fi Calling National)