How to Reliance CDMA phone number from SIM- I forgot

Hi,

Since reliance infocom is now converting to 4G. I thought to convert my old reliance cdma sim to 4G. But problem is that I forgot number of my sim and I dont have money balance in it to make call to see its number. And without knowing number, I can't migrate it to new 4G network sim.

Any idea how can I get reliance cdma number out of it without calling .

I think in that case, best way is to simply do a paper recharge of Rs. 10 or something, generally on recharge they send confirmation message along with mobile number associated with SIM.