I would recommend go to your local CELL C Store or cheeckers and buy a sim card and load R10 of airtime and make sure you rica your card. If you have a compatible cell c that can receive 3G signals or Dongle to test if you have wooooosh.
Doesn't get updated as frequent I know of 5 people - that had no coverage using CELL C map but when they tested a sim card they were able to get "woooosh" signal HSDPA/WDCMA and they have been happily connected for 2 weeks with 1 or 2 problems but nothing major.
Coverage map is also not 100% accurate, so even if it does get updated recently, it does not mean much. Best is to try and borrow a modem, alternatively use RichardG's suggestion. just remember, you will need to have a UMTS 900MHz compatible cellphone (Quad Band). Other phones will not be able to utilize the WHOOSH towers
I get disconnected this morning and can only connect to EDGE and I am unable to force the connection to HSPA+ it just refuses to register on 3G. I just happen to go to CellC's site and check the coverage map and I see they have removed my coverage
So I it's back to vodascum for me until I can get a answer.