SIMCOM SIM800H change in hardware. S2-105HG / S2-10651 , S2-1065N / S2-1065Q

SIMCOM has updated the hardware of SIM800H modules with hardware versions (S2-105HG / S2-10651) due to the fact that the power amplifier chip that these modules used (RF7176) is discontinued from production line. The Firmware also had to be changed due to modifications necessary for operation of the new power amplifier chips.

All the new modules ( with hardware versions(S2-1065N / S2-1065Q) ) will be having the new power amplifier chips namely RF7198. According to SIMCOM this change in hardware wont affect the properties and characteristics of the module.

Please note that:

  • firmware for the new hardware version of module differs from the old version of the firmware. Therefore, a new hardware version module can not be flashed with the firmware for the old hardware version module.
  • firmware image files for the old and new hardware versions will be with different names. Firmware for the old version is designated “1308B06SIM800H32_BT” while the firmware for the new version is designated “1309B06SIM800H32_BT”.


Firmware files for SIM800H

All the firmware files can be found at the firmware collection page of this blog. If you want to contribute the files you have you can do so by uploading your files to user uploads section or by emailing me the files you have.




Disable PIN code using Gsm modem AT commands

If you have a PIN code enabled SIM card and want to remove /disable PIN code using AT commands follow these commands,
suppose 9546 is the current PIN code , Replace 9546 with your PIN code, >>> shows the response from modem.

>>> +CPIN: SIM PIN // pin codes need to be entered
>>> OK

>>>; OK

AT+CLCK="SC",0,"9546" // disable pin code
>>> OK




Show State if Sim900 originated call is recieved

By default when you make a voice call Sim900 doesn’t send any response if the called party picks the call. Sometime its important to know if the other side is getting ring or has picked the call. In order to show the state we have to configure the module using the following AT Command


After sending the is command if a number is dialed, a URC string “MO RING” will be received if the other mobile is alerted and “MO CONNECTED” will be received if the call is answered.