SMSHub
KalSMS
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SMSHub
KalSMS
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Turn your Android phone into SMS API gateway
I built one, way back (I'm not an Android dev, kind of hacked it together but on the positive side it's extremely simple: https://github.com/niryariv/KalSMS )
At the time there were a lot of developing countries projects using SMS as their main interface (a lot of work with community health workers etc). Orgs like the UN would set up an SMS gateway by hooking a desktop with some hardware, and of course it would be very vulnerable to stuff like power outages, someone tripping over the wires etc and you had to get the technician to set it up again. With smartphones you had the all the required setup in one cheap, small and very durable package, no training required to operate.
What are some alternatives?
android-sms-gateway-server - Android App, which allows you to send and receive sms via REST-API
traccar-sms-gateway - Traccar SMS Gateway for Android
QKSMS - The most beautiful SMS messenger for Android
android-smsmms - Library for easily sending SMS and MMS for Android devices
gat-app - Android app for sending several types of SMS like Class 0 (Flash SMS), Type 0 (Silent SMS), Message Waiting Indicator
matrix-sms-bridge - Matrix bridge, that allows you to bridge matrix rooms to SMS with one telephone number only.
mobile-gateway - Mobile Gateway for Nuntium (aka Local Gateway)
voipms-sms-client - Popular Android messaging app for VoIP.ms, a Canadian VoIP provider
smack - 📲 Forward SMS and calls from any SIM card to Slack.