Our cell phones have quickly become the center of our digital universe, no longer containing just phone numbers and ringtones but photos, e-mail, music and a continuous text-message conversation with friends. As these devices grow smarter, we conversely demand them to be smarter.

An entirely new market has popped up around this idea — that of our cell phones knowing where we are and what we need. They may initially strike the paranoid among us as a bit invasive, but the following technologies, along with a host of others, are helping our cell phones help us more.

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