android - phone to phone...unlimited SMS? -

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i have idea app requires lot of data exchange between users of app. sms seems simple way done, safe assume smart phone users have unlimited sms? otherwise app won't popular due expensive rates sms.

if bad assumption, can tell me other means should consider accomplish phone phone communication? had hoped alternative used data service instead of sms. have read many (so many) forum posts sort of thing , have read nothing conclusive.

a bit app's requirements:

  • users build network of 'friends' coordinating among them.
  • when 1 user creates event on device, users in network should notified.
  • user's can instant message other users on network

so, need mechanism getting of done. after reading bunch of tutorials, can see how using sms, not sure if that's idea. people have said sort of job require central server, i'm not quite sure how work. not opposed solution involves server, need me started in right direction.

thanks in advance.

number of sms not depend on phone model depends on carrier , country.

how users "build" network? when add friend notified via sms? how friend know use app?

i suggest using internet , having "inbox" every users. notifications can sent inbox.


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