Zong offers free calls to all Zong numbers in Pakistan from Islamabad/Rawalpindi in just Rs. 7 + tax/day or Rs. 41.93 + tax/week.
- To subscribe Islamabad/Rawalpindi offer send ‘isb’ to 522 for whole day free calls
- To subscribe Islmabad/Rawalpindi offersend’isb7′ to 522 for whole week free calls
- Free calls are only from Zong to Zong