>Are there any phones that can do this?

Yes. The perfect phone to do this would be the one you are holding in your hand to read this post!

It is not about spending more money to get a different device.

This is on you friend. If you want it, all you have to do is either quit clicking on the app or delete the app. Its not that hard. But your self control must come from your self.

If you buy some cheap very limited phone you will not fix anything. You will probably just be unhappy for a week and then go back to your current phone.

When you say you are soending too much on in.app purchases.....it would be a worse decision to spend more on a new phone right?