Verizon Wireless has completed initial testing of its 4G wireless service — offering speeds five to 10 times faster than existing networks — and said it will start the commercial roll out in 2010.

Using a new technology called Long Term Evolution (LTE), Verizon successfully made calls in Boston and Seattle — the first two cities to offer the service.

The calls used the new 700 MHz spectrum, recently freed up for cellular use after being assigned to TV stations.

Verizon Wireless’ chief technology officer, Tony Melone, said the…