how and why of free sms

[punter]

i think aircel is the only company wanting to give free sms. they want to give because they are small company. but big airtel and vodotch (vodofone-hutch) dont want to. in tamil nadu aircel was no.1 company before. they gave free sms. so airtel and vodotch also gave. now airtel and vodotch have gained supremacy in tn and chennai and have forced combinedly and stopped free smsfree sms can start once again only if goverment put 1 paise sms termination charge. if so, everyone will give sms for 2 paise onlyhow is it