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Q.:  Have Sony’s modem an extended AT command set ?
A.:  Yes, but there is no official documentation from Sony. I created my own Sony reference for the Z5 series.

Sony Z5 96k (not official)
from 11th February 2002 – 16 pages
compatible phones: Z18, Z28, (MZ5 ?)

Sony J5
standard AT commands of firmware version 3.8.4
compatible phones: J6, J16, J26, J7, J70, Z7
Old firmware versions need an extra space: AT<space>Command. All -S commands of the Z5 series are broken within these newer phones. A new command is introduced to access a upper level protocol: AT-SGBP=?

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