I was wondering if playSMS can send SMS through an android phone, instead of a GSM modem, just like FrontlineSMS can?
Currently this feature is not available. Planned to be added in playSMS for Android and sms_sync (utilizing Ushahidi SMSSync app)
Take a look at Android gateway with smsgateway.me.
Additionally, I have coded an integration from playSMS with sms_sync in order to sms_sunc pull messages from playSMS, but didn´t word very well.