To provide fast with quality services to users, zong has launched new balance checking service string code *333#
At first Zong was using of Paktel's *222# then Zong launched *031# but now the closed *031# and launched *333#
031 is Zong network code, All networks in Pakistan have only one code of two digits and subscribers get 8 digit mobile number
Ufone network dialing code i 033
Warid 032
Telenor 034
Zong 031
Mobilink 030
