Hello there,
I have read you requirement carefully, i understood your work, you want some changes in your existing website, and maintain this, also iOS and android app, can you please provide me your existing website URL and changes list, after that i will let you know exact time and cost for this project. I can surely help you in making required changes on your website as well as the mobile app.
We are a 10 year old IT company with highly skilled designers and developers to work on php, Mysql, Jquery, Wordpress, OSC, Magento, OpenCart, Mobile development, iPhone, Responsive etc.
It would be better if you come to have a close discussion over chat .
Best Regards
Harpreet Singh