Hi so I just got an iPhone and put in my brothers old sim with airtime in it, but everyday 10rand keeps disappearing can some one tell me how to fix it and what's happening?

Check your data connections as smart phone use a lot of it in the background.
Also there's the Fruity Tax to take into account/

Check your data connections as smart phone use alot of it in the background.
Also there's the Fruity Tax to take into account/
Where can I check data coverage on iPhone, and what's fruity tax?