“Tri-band” phone
In order to further expand wholesale mobile phone network operating system capacity and improve the voice quality while make a phone call, recently the market launch a new phone -“Tri-band’ phone . “Tri-band” phone refers to the mobile phones that receive the signal of GSM900Mhz, DCS1800Mhz and PCS1900Mhz at the same time, and which signal …
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