To boost my blog traffic, I held a contest, awarding $50 gift cards to readers I picked at random.

The API portal allows for defining different developer packages (bronze, silver and gold) and supports API invocation Rate Limiting rules which are enforced by the gateway.

So I started digging around the terms and conditions of voice prepaid cards. Vodafone, it turns out, offers prepaid cellphone users up to 15 megabytes of data traffic a day for about $2.