| See also |
used cellular phond Mobile phone radiation and health.
With high levels of mobile telephone penetration, a mobile culture has evolved, where the phone becomes a key social tool, and people rely on their mobile phone address book to keep in touch with their friends. many people keep in touch using sms, and a whole culture of "texting" has developed from this. the commercial market in sms's is growing. many phones even offer instant messenger services to increase the simplicity and ease of texting on phones. cellular phones in japan, offering internet capabilities such as ntt docomo's i-mode, offer text messaging via standard e-mail. Mock-up of the "portable phone of the future," from a mid-60s Bell System advertisement, shows a device not too different from today's mobile telephones. crll phones
^ gsm cloning usedc cellular phone A comparison of Mobile development platformsvree ringtones .
Related non-cell-phone systems Signal strength
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