Most cellphones come standard with a slew of features that may include a satellite tracker, games, music players and Internet access. But operators, advertisers, device manufacturers and software makers have struggled to come up with reliable data that tell them how the phones and their features are being used. Metrics, based in Seattle, was set to announce Monday what it said is the first service that directly and continuously tracks which services are actually used. Knowing how often and for how long subscribers of many different operators surf the Internet with their phones, which games they play, how many e-mail messages they send and what other features they use could unleash the cellphone's advertising potential, according to industry experts.

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