Dear Sir,
Greeting from my side,
As per your post, your requirement is develop chat app, which worked on android and iOS app too.
Also it must be working smoothly in 2G network an used GPS location.
also need voice and video calling in that app.
We can do same as per your requirement, after reading your all requirement.
Let me introduce our self,
We constantly provide best services, as per market and demand of clients. "Where thoughts become things" is our main motto.
Basically from our side you will find 3S Services which include,
Software as per your command,
Solution as per your search,
Satisfaction as per your acceptation.
We are 15+ year old IT company with team of 60+ experienced IT professional, Who completed 5000+ projects by serving 27+ Country and nearly 70% and more repeated customers for satisfaction their new needs.
Thanks & Regards,
Mxicoders