UK telecom company BT, which hasn't been known for its innovativeness lately, has something interesting up its sleeve — a system called BluePhone which will let you use a cellphone to make phone calls over a voice over IP connection when at home, and then connect to cellular networks everywhere else:

The handset will make voice calls via IP over Bluetooth when the customer is at home or in the office and then normally GSM calls when the customer is travelling. The Bluetooth base station will presumably also allow the mobile handset to surf the Net via xDSL when the Bluetooth connexion is active.

Verizon is said to be working on something similar here in the States.
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