Zong 4G SIM Upgrade Offer, Zong weekly Zero Balance Offer
Zong 4G sim Upgrade offer is those who want replace their old SIM in new 4G SIM. Zong gives 4000MBs internet data offer on new zong 4G convertor. Now you can voice call on Whatsapp to your loved one whole week. In this package Zong offers 400 free zong minutes and 4GB internet data on …