SMS was originally designed as part of ( )，but is now available on a wide range of networks ，including 3G and 4G networks.A.PHS B.AMPS C.GSM D.GPRS
SMS was originally designed as part of ( )，but is now available on a wide range of networks ，including 3G and 4G networks.
A.PHS B.AMPS C.GSM D.GPRS
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