Wednesday, December 26, 2012

[Solved] Unable to check balance on BSNL Mobile (Invalid MMI Code)

I have just ported my Tata Docomo number into BSNL Mobile and it is working good. But I am not able to check my balance and recharge top up coupons because USSD code that we run, like *123#, are not working. It says "Connection problem or invalid MMI code".

Unfortunately, it is happening only in my Samsung Galaxy Y Duos GT-S6102 which is based Android 2.3.6 Ginger Bread. I tried on another cell phone and there was no error. Talktime balance showed up and even I recharged with the top up coupon.

My phone has dual SIM support and there is no corruption on both SIM ports. Message centre number for BSNL mobile is also correct and I am able to send SMS too. There was no problem with Tata Docomo either.

Don't know what's the problem with MMI codes.

If any one can help me please reply within comment section below.

I just did reset factory of my phone and inserted a new BSNL SIM in it that I bought. This time it configured the the SIM correctly for USSD code and now everything is fine. I thing with my first BSNL SIM the phone could not do the configuration for USSD/MMI code and with the new SIM it configured successfully. And now USSD/MMI codes are also working my first SIM.


  1. sorry could not help you; but i am facing a similar kind of problem here in kolkata. when i am trying to access net with samsung galaxy ace, no signal was there.but with the same sim, nokia 5800 is providing full 3G access. no problem in calling or sending sms with samsung; only net connection is not available. :(

  2. i cant send message and can't call but i can receive them both.. it says invalid mmi code error.. I am using nexus 4..