Hey mate,
I suggest we discuss via PM your requirements before I formally increase my bid amount.
There are a number of requirements we will need to flesh out with your app before I can give you an accurate bid.
I.E.
Does it need to be android & iOS?
What external third party API's will be required if any?
If mullti-platform, do you need native code?
I'm sure there's a hundred other requirements, so if you could just message me via the freelancer messaging system, we can nut out your requirements.
Also, I prefer to start a bid low, and then increase the milestones as we go, there is no need or requirement to have a large starting bid, you can increase costs "as you go"
I have a background in web and mobile development, you can learn more in my profile or google me.
Regards,
Christos.