What free texting app can i get for ios4.2.1?

I have an iphone 3g and i want a free internet requierd app that gives free texting and callin at no cost so i don't have to pay for activation my mom says that i have to pay for activationand pay for it everymonth but i don't get alouence so i can't pay for it every month please help me

Text plus

Talkatone- it gives you free calls and texting but you need a gmail

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