To switch your Abra wallet from one phone to another phone, you will want to apply the recovery phrase from the first device, and enter it into your second device. Click here for instructions for backing up your Abra wallet.
Your 13-word recovery phrase never expires. You will need to use it any time you wish to recover your wallet and thus can use it as many times and on as many devices as you wish.
At this point, you have successfully switched your wallet from one phone to a new device.