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no, you misunderstand. Things like aim require a 3g wifi data usage 100% of the time to keep me online. I'd prefer someething that didn't make me use so much data, because I don't have unlimited.
Oh and yeah, related to your query that whether Whatsapp is free or not. It actually kind-of is. When you're not texting, you can just close it (Blackberry) or end task (android) or home-key it (iPhone). Later guys!