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.
Solution: 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.
Why I have said 'one more' because I may not be the only person who was frustrated with the Tata Docomo's poor 3G service at our town and decided to move on with another cell phone network operator. I am using Tata Docomo for the past 1 year. I have activated 3G service only few months before. But I found its 3G service as an unpleasant one. So decided to port the number to BSNL.
First I went to RB Agencies, opposite of Big Bazaar super market in our town. It is an exclusive outlet for BSNL. But they failed to port my number, I don't know why. In 2 months around 4-5 times they have asked UPC (Unique Porting Code) for more trials, but all time it was just failing. At last they said to get a new number or go to the BSNL main office.
I went to BSNL main office and applied for MNP one more time. And here it is, after a week the number is ported to BSNL.
Hope I have decided for good by choosing BSNL. Expecting a good service from 'baap' of the cellular network operators.
Or I can port to another operator after 3 months :D :D .