This is great offer by Zong Pakistan to all Zong customers that can replace or upgrade their old 2G and 3G zong sim’s to 4G LTE sim free of cost in all Zong 4G coverage areas. Zong recently decide to start upgrading all 2g/3g old sims to 4G sims without any charges for promoting purpose.
Zong Upgrading All 2G and 3G Sims to 4G Free
how to upgrade
Zong customers of following cities can replace zong 2G and zong 3G sims to super fast 4G LTE sim absolutely free by visiting any Zong franchise or Customer care center.