... ainternet order 3. GPRS communication mode Customized Portable Wireless GPRS SMS Printers Hardware Instruction Pull to open the ... cover, and change the paper Keys1 key: 12 key: a, b, c, A, B, C, 23 key:d, e, f, ... GPRS connection, User name and password is not a must in the most countries.So call your GSM ... operator to confirm.If User name and Password is a must in your country, please entry the related ...