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| Cellular phone tutorials and guides to 3G. |
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| http://3g.cellular.phonecall.net/ - 英文 |
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| This tutorial discusses the basics of radio telephony systems, including both analog and digital systems. |
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| http://www.iec.org/tutorials/cell_comm/index.html - 英文 |
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| ·Sendo |    |
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offers design and development of GSM mobile phones and other mobile co [52RD.com]
mmunication devices |
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| http://www.sendo.co.uk/index_flash.html - 英文 |
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