What could be the best to verify email for a mobile app? Can be iOS or Android app. It's too much trouble for user to go back to email app and then be redirected to browser and then verify there and return all the way to open their mobile app. Is there any easier way to reduce the functionality and increase the smooth flow of the app?
You can use OAuth 2 authorization for your app. And use Google, Facebook, or other OAuth Resource providers. It's the most easy and foolproof method of managing users in your app. On top of that, you could access many more pieces of information of users using the SDK provided by Facebook and Google.