Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Do you mean it is not triggering when you press harder? I haven't had any issues with it in Mail.
 
You might wanna adjust the sensitivity level in this case. Whatever that you peeked at shouldn't have a problem popping when you press harder, so I'm guessing it can be a software issue or that you are not pressing hard enough.

I kinda find it weird to wanna press so hard on my phone though.. Those with iPad Air 2 are probably aware that we wanna tap as light as possible or the screen may have a ripple effect lol
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.