2.5mm gsm data cable usb serial cable gsm T189, T190, T191 data upgrade,upload,backup FT232RL/CP2102/PL2303HX Electronics configuration: USB serial(TTL 3.3v) to 2.5mm gsm data cableUSB gsm upload, backup, upgrade cableCP2102, FT232, PL2303 optionalPinout: VCC, GND, TXD, RXDTypical function:Send/Manage Text Messages. Edit/Manage Phonebook/Calendar/Profiles/WAP.Sychronise Phone With PC.Change Logos ...