Assuming you don't sign in with one phone in one country, then sign in on another phone in an entirely different country 5 minutes later, you should be fine.
As long as it is you playing on both devices and any device that accesses your account, you're fine. I play on three different devices, myself.
I pLaY oN fOuR
As long as it is you playing on both devices and any device that accesses your account, you're fine. I play on three different devices, myself. I play on four, so...