Startup wireless operator Amp'd Mobile has raised another $107 million to fund it's content-heavy mobile entertainment strategy for a while longer.

Unlike other wireless operators, Amp'd doesn't own a wireless network. It rents a portion of Verizon's network and it's an expensive strategy. Industry analysts estimate Amp's will need at least a million subscribers to become cash-flow-positive. After about a year in operation, Amp'd is estimated to have just under 200,000 subscribers.

The new funding round in part includes contributions from prior Amp'd supporters Universal Music Group and MTV Networks, as well as a number of venture capitol groups. It brings the company's total funding to more than $360 million.