1. AIRTEL
Type FREE and send it To 54321(tollfree) OR send a blank sms to 59103(tollfree), u will receive your mobile no. in a sms, Or dial *140*1600#,*400*2*1*10#, *121*9#
2. AIRCEL
On your aircel mobile dial *122*131# or*888#
3. TATA DOCOMO
To find docomo sim no. dial *1# or*580# or *124#
4. RELIANCE
On your reliance mobile dial *1# or*111#
5. IDEA
To find idea sim no. dial *1# or *789# or*100# or *131*1#
6. VODAFONE
On your vodafone mobile dial *555# or*555*0# or *111*2#
7. VIRGIN MOBILE/VIDEOCON
On your virgin mobile dial *1#
