We meed to sent one form to a group of phones because if we do it for one by one phone then we will have same form many copies. This makes us difficult in analysing data as we have about 20 mobiles. So better to have single form loaded to all mobile phones. I will wait untill Alex comes back. Please pass this query to him and reply the solution.
Is there any chance you could provide a log showing the forms failing to send? It sounds like either:
1) you have more than SMS device attached to FrontlineSMS, and forms only successfully send from one of them, or
2) the phone numbers for the phones which do not receive the forms are entered in a format that is not compatible with FrontlineSMS or your SMS device.