When you make an app that sends sms msgs using the android bulit in or the smsmanager, are those text msgs sent for free? or they are sent as part of whatever text contract the user has? does anyone know?

No absolutely not ! Nothing free in this world. Once you try to send a message with SMSManager that request will forword to your sim card operator. Obiously your operator will charge for the sms. If you want to send free messages you can use SIP Technology.

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