"Consumers who already own a dongle also have the option of purchasing a 3GB data bundle which is valid for a year at R399 once off."
@RPM: As Cell C are the only ones offering a bundle without hardware, I can see why you did not include this in your final table. OTOH, since many do have a modem (i.e. the Ipad was mentioned) it might have made sense to include that option in the table, ne c'est pas?
That has been added to the table (as i see it, I may be wrong tho).
The "effective price/MB" excluding the modem of R350, i.e.
Vodacom = 399-350 = R49. Then 49/1.2/1024 = 4c
Cell C = 749-350 = 399. then 399/3072 = 13c
EDIT: Now the question is, is the Vodacom USB dongle worth R350? I have no idea, but perhaps we can work on a bound.
Say Vodacom's price was 13c as well. That equates to...
0.13 * 1.2 * 1024 = R159.74 (for the MBs over the year)
Implying USB Dongle => R399 - R159.74 = R239.26
This means that if VC's dongles cost R239,26, their bundle to be equivalent to that of Cell C's. If VC's dongle costs more than the R239,26, they are more cost effective than Cell C's bundle. Vice versa for the opposite (the negation of that statement is true as well).
If any expert can give an approximate cost for VC's dongle, we can find the winner