If you managed to grab a job working directly for an Oil & Gas dept doing mobile (they exist), you'd be able to command 90k+. Work would likely be boring though - but you'd get impressive bonuses, benefits and other stuff that you'll never find at the mobile agencies that exist in this city. Most of the agencies are marketing houses - development isn't treated as a priority at most of them.

I will tell you this - mobile dev experience (especially iOS) is hard to find in this city - make sure you get as much as you can for your experience level.