How to check mobile number code if u forget

How to check mobile number code if u forget

Mobile No Check Code of Warid

Code	Charges
*321*8*1*3#	Free / No Balance

Mobile No Check Code of Ufone

Code	Charges
*780*3#	Free / No Balance

Mobile No Check Code of Zong

Code	Charges
*2#	Free / No Balance

Mobile No Check Code of Telenor 

Code	Charges
Empty SMS to 7421 / *8888#	Standard SMS rate

Mobile No Check Code of Jazz

Code	Charges
*99#	Free / No Balance