Write some Software

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. Major Functionality Requirements: Both data texting and SMS capability. Default to data texting, switch to SMS if no connection 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 Required Features: Error messages if transmission fail or no connection Ability to see when other person is typing Delivered receipt on each message Read receipt on each message Notification - picking system sounds and alerts Vibrate toggle Search contacts Change font size Pop-up display for new incoming messages Notification at top of screen of unread new messages All standard contacts features Pulls up contacts information from Android All standard phone features Shows phone call as a log entry in text conversation Settings screen