Hi sir,
I read your requirements and I think I understood what your app needs. I only have one last question in order to see how the problem should be solved : The information regarding your keywords sent in the SMS to the provider will be returned by the provider or the app should search on a database on a server? I have some experience in developing Android applications so this project shouldn't be difficult for me .
Looking forward to receiving a positive answer.
Best regards,
Lacra