Is there a service that gives you a default phone number and forwards sms messages to your real cell number?

What I'm asking is if there's a service that is offered that gives you a default phone number to which you can give to people and when they text (sms) you it forwards to your real cell phone number. The reason for this would be for anonymity. So it would pretty much just disguise your real number and forward all your sms messages. If there are some I'd appreciate any reccommendations on some of the services you guys think works best or is cheapest.
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Price in India|FreeSMS
through Internet