... and SMS functions in this SIM card)2. Install GSM antenna3. Connect power adapter4. Switch on GPRS Printer begins ... 1time, 3 is ok;Then, press 4key 1 time, 4 is okThen, press 5key 1 time, 5 is okThen, ... input, press Del key to delete the last number (4)Printer ID:Normally, set the SIM card number as printer ... show on the print note, so it is necessary....... wireless GSM SMS/GPRS Order Printer(Hot Item)