Great question — answering as the UphillTech team:
For rooted Android it is possible to bypass an API and send Class 0 SMS. There is a project on Git Hub called ZeroSMS : ZeroSMS is a proof-of-concept demonstrating a way to send Class 0 SMS on android >=2.3. Note: this only works on versions 2.2 -> 4.1.2, the sendRawPdu method was removed, so you will need to find a new way to do this.
Full answer by Scrool: https://stackoverflow.stackexchange.com/a/12873325 (CC BY-SA 4.0).
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