Littlefeet, which makes antennas that can help prevent dropped calls on cell phones, said last week that it has raised $22 million in third-round venture funding.
Littlefeet says it will use the money to improve its antennas, which provide coverage in areas with weak signals. However, Littlefeet's system works only with GSM cellular networks, widely used in Asia, Europe and some parts of Latin America-but rarely in the United States.
AT&T Wireless and Cingular Wireless, which operate TDMA networks in the United States, are expanding their GSM networks to include new cities.
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