First off, speed is just the teeny tiny tip of the connection iceberg, and using your phone to test doesn't do much for testing your connection over the ps4. Beyond simple down and up speed you need to worry about packet loss, signal jitter, other things on your network at the same time using bandwidth, whether you are hardwired into your router or not, whether your provider has any sort of system in place that throttles down a long-term persistent connection after a specified amount of time, and even who you are in a fire team with. If you are in the uk and in fire teams with people from places like Australia, New Zealand, the us, or South Africa for a few examples, you or your friends will have a massive lag affect on people you are matched up against.