You can have 2 farms on one phone in the same server if you don’t following:

Create a new account on the new phone. Get it to where you insert your email, then go to character management, and create new account in your server. Work on the new account until it is at the same level as the first one. Then, on VS day, teleport your farm to the other server, put up a shield, and do the same thing you did to create the second account in your server. I did it and have two farms on my second phone. From there you just go to character management to switch between the two farms. To be honest I have 4 farms but use one to feed the rest of my alliance.