I have a sim900 modem on arduino uno controller. On a door event I send a SMS to a cell number. This works correctly. The problem is that the credit come off the airtime balance and not from the SMS bundle. I used a prepaid vodacom simcard.
I need some help on this
I finally managed to send an SMS using the AT+CMGS modem command on my Nokia 2330, but I haven't received it. Is there something else I have to do, or do 'own number' SMS's not get sent?