What do the Large Corporations do when they release their games? Battlefield - Call of Duty

These companies work in the same field as Android Mobile -

The Operating System is the same, but the hardware is different amongst users. Unless your game is for an IPhone - You need as many beta users as you can get to make sure you can work out all bugs across multiple types of hardware.

Best way to do this is set a Set time registration - 5 days open for the Beta - the more you get the better but here is the secret - you need to get the Beta testers involved - create a community - This has so many benefits

for example you can save months in costs related to testing - as you literally have people working for you for free.
Working together they will provide you a huge insight into what you can improve on and if you actively engage with them they will stay by your side as you complete the app. They will feel like they played an important part in the application and will want to share their work with everyone they know.

Hope this helps