Vodacom Useless in Big Metropolitan Areas

Johannesburg, Germiston side - for over a week now both my iPhone and iPad cannot connect to the internet while I have 4-5 bars 3G signal indicated on both devices.<br> <br> One device - it may be a problem with the device. Two? Vodacom is the problem.<br> <br> I am paying for a service I'm not receiving, and this is getting ****** ridiculous.<br> <br> I would really like Vodacom to please please please get their network up to speed, especially since this is in Johannesburg, the economic capital of Africa, and not somewhere in the far off Karoo.