While using camera phone get heat up as it doing heavy processing.U will notice heavy battery drainDuring recording video it all due to heavy process.Also if u use it in bright sunlight then it will more heat.U also notice brightness to drop signific...
2nd one is 1st copy which look like original but not upto the mark like original.See this post hope it will help.https://www.quora.com/What-is-the-difference-between-an-original-and-a-**bleep**-display-of-a-phone.If its help mark it as solution