Yes, but sooner or later you will be locked out from switching to much. At first it lasts for like 24 hrs then it's like contact devs.
Its possible… but did you read the ToU? It states you cannot have more than 1 acc on the same device. Also after 5 switches youd get locked out of your phone (kaw) for six months since the first switch
if you "jail break" your phone, then yes, you can. However, jailbreaking your idevice voids the warranty Also, multiple accounts on one idevice is a ToU violation, and WHEN you're discovered, all your accounts will be banned, so please don't risk it