How to Install SMS Gateway App :

Navigate to APK FILE LINK

Download the android app file (.apk) in your mobile and install it. Check the video for more details.

After install the sms-gateway app you need to enable USB Debugging. Please check below video for usb debugging.

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When you successfully enable developer option and enable usb debugging inside developer option you are ready to use the SMS Gateway

If you see any system warning and block sending sms and mark as spam, please follow the video below and increase sms sending limit.