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Your use case is quite different from my business requirements it seems. We are looking to send and receive SMS from the providers API as opposed to a specific phone or device. I think the android SMS app integration is probably a better fit for you: https://github.com/tijder/SmsMatrix
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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matrix-sms-bridge
Matrix bridge, that allows you to bridge matrix rooms to SMS with one telephone number only.
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