Zong Reviews & Complaints
By: Muhammad Tariq
Contact information:
Zong
for the last one month, the code **21*031622# is not working on my cell Iphone 5s. when i apply this code, i receive the error message “Error performing request Unknown Error, Setting Registration Failed etc”. I talk to zong representative, he told me first activate call forwarding service and then activate the Miss Call Alert service but in vain.
kindly solve this problem.