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== Overview == In addition to the standard voice function of a [[telephone]], current cell phones can support many additional services, and accessories, such as [[Short message service|SMS]] for [[text messaging]], [[e-mail]], [[packet switching]] for [[access]] to the [[Internet]], and [[Multimedia Messaging Service|MMS]] for sending and receiving photos and video. Most current cell phones connect to a [[cellular network]] of [[base station]]s ([[cell site]]s), which is in turn [[interconnect]]ed to the [[public switched telephone network]] ([[PSTN]]) (the exception is [[satellite phone]]s). There were more than 850 different certified mobile products in the United States in 2009.<ref>The number calculated using [[FCC]] data. ''See'' Office of Engineering and Technology, FCC, Equipment Authorization Search.[https://fjallfoss.fcc.gov/oetcf/eas/reports/GenericSearch.cfm]. The [[data]] represents applications for grants issued for new FCC IDs for equipment class parameters โPCE-PCS Licensed Transmitter held to earโ and โTNE-Licensed Non-Broadcast Transmitter Held to Ear.โ [[Data]] does not include applications for permissive changes and counts multiple entries for the same FCC ID only once.</ref> In that same year, approximately 172 million mobile phones were sold in the United States. Of these, 27% were [[Internet]]-capable [[smartphone]]s.
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