I have two iPhones that I want to sync together?

I have an iPhone 5 and an iPhone 5S. I use my iPhone 5S with t-mobile and I plan to use my iPhone 5 internationally with various SIM cards (my provider unlocked it for me). They are both hooked up to the same iCloud account, email, etc. I have been able to synchronize my iMessages (all of my messages appear on both phones and if I open one message on one phone it marks it as read on the other phone as well). How can I synchronize everything together? I want to be able to download an app and have it be on the new phone, delete an app and have it deleted off both phones etc. (i know that calls/texts won't work because I have different phone numbers). Basically I want to be able to pick up either phone and not notice a difference.

Sign into the same Apple ID on both devices.

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