There is a way to see your mobile number on your phone. It depends on your service provider. For Example if you are Airtel user then type *121*9#, it will show your mobile number.
For different service providers the instructions are-
Virgin Mobile: *1#
Docomo: *580#
Aircel: *888#
Idea: *1#
BSNL: *1#
Vodafone: *777*0#
Videocon: *1#
Reliance: *1#
