mobile

Hi
I has develoed an SMS sender app using VB from VS2005 and it works fine. however, if i send a message for 2 recipients, for instance, the carrier/service provider discounts 6 sms on my account. :(
I tried to send the same message to my other new mobile phones and only one sms arrives to each phone. however, the service provider discounts 6 sms because their systems registered 2 messages, 3 for each number... Very strange.
If i send ans sms by hand using the phone (instead of app) the service provider only discounts one sms from my budget...

Any ideas?

Thanks a lot

Alex