Create your own Software as a Service (SaaS) platform that enables users to utilize their android mobile devices as SMS gateways, as well as send and receive WhatsApp chats.
Check out the demonstration here: https://codecanyon.net/item/zender-android-mobile-devices-as-sms-gateway-saas-platform/26594230
Please note that this file has an "UNTOUCHED" status, meaning it contains the original developer code without any modifications.