This doesn't seem very special. Where I live, you could put a pay-as-you-go SIM card from O2 (the iPhone's network, so no unlocking needed) into your phone and add "unlimited" internet access for about £7 a month.
I don't have an iPhone, but I buy a £10 (~$15) top-up monthly, which gives me 300 free SMS messages. Then I use £7 of that top-up to pay for the monthly internet add-on. I have £3 left for calls and other random usage and if I need more, I just add more that month.
I don't have an iPhone, but I buy a £10 (~$15) top-up monthly, which gives me 300 free SMS messages. Then I use £7 of that top-up to pay for the monthly internet add-on. I have £3 left for calls and other random usage and if I need more, I just add more that month.