Is GUI work on Mobile Platforms ?

In my project large number GUI is using . DrawCalls is less than 70 . Is this condition supports on mobile platforms ?

Yes

unless it’s < iPhone3

There are very few absolute limits on number of draw calls/number of GUI calls/etc. etc. “supported” on mobile platforms - but each one will slow your game down, so it’s a question of what you consider to be acceptable performance.

Considering that the capabilities of mobile platforms vary enormously (you’ll get wildly varying performance on an iPhone 3 compared to the latest Android tablet, for example), the only way to answer this question is for you to deploy it to your target device and test yourself.