Hi everyone. I have an Iphone 4S with IOS 8.4. For this weekend I plan to give the phone to a friend, who wants to use it with her Amazon Register account (similar to Square), for some Flea Market sales and Credit Card processing. I will remove the SIM Card and use it with another phone that I have, and since the Fleamarket has WIFI, she will be able to connect to the internet easily with having a SIM Card. Here is my question: Can I somehow allow only use of one App? Amazon Register, that is. I would like to block access to my email, contact and photos. All I need is to let her use this one App. I remember that an Ipad has a feature similar to that, but am not sure if an Iphone can do this too.