Best cellphone network?

[Unregistered]

Hi. My cellphone contract is up for renewal. I am currently with mtn. Thinking of changing as mtn's call charges are high. Which network is more reliable - mtn, 8ta or cell c? Their rates are better but i am worried about network issues in Johannesburg area. Any advice? Thanks!

[Unregistered]

Not sure in terms of network coverage.......but the service from MTN is terrible, esp with regards to repairs.
Have found this across a number of their stores, as well as the contact centre.