Hello, I was wondering if there is any way to send a sms, without using Wi-fi and free of charge.
And if the sms is for pay, then in the app you have to choose how many money you want to charge, and when the user has no wifi, bluetooth or money still can send a sms with my app because he/she charged money on it.
I know is complicate but I searched on the web and find a few solutions, but neither of them solved the problem.
Is this possible?
Thank you so much in advance!