TEXT MESSAGE APP PROJECT

I need a text messaging app Android (think WhatsApp or WeChat). This offer assumes you have a previously built text messaging app which can be tweaked and rebranded, so I am looking to ideally not create a huge development project. But depending on the sophistication of the product you already have, there may be further work to develop certain capabilities. I will need screenshots of your previous product and/or specifications. Ideally, it would be a product already in Google Play. Portability to iOS a big plus (for future development). Please include the SDK on which the app was built. Required Features:  Both SMS and data texting capability  Security features – up to commercially acceptable standards  Group texting (with naming of groups)  Emoji handling  Have basic back-end infrastructure set up  Design up to basic standards Additional Preferred Features:  Data calling  Knowing when the other person is typing a message and read responses  Voice messaging  User profiles/picture uploads  Contacts list management