Question: how to check internet balance in zong data sim?
Answer: Dial *6767# (only from Zong Master Number)
Subscribe/change MBB internet bundles on your MBB device using Zong Master Number. You should have balance in your MBB number to subscribe internet bundles from. From your Zong Master Number you can. Know what your MBB Number is. Check Balance of your Zong MBB Number.