That nostalgic call.
When using the iPhone Cassette Case always remember to turn your phone to side B when answering. This is very important. Some users often forget this significant detail and end up receiving a blank call. We recommend that you label the sticker with a permanent marker to avoid any confusion that may arise. We don't even know why you would do this but if you must, you should minimize the removal of the iPhone from its shell to avoid damaging the sensitive device.