How to Speed Up iPhone 6(Plus),5S, etc: Tips & Tricks to Speed Up Any Slow iPhone Models Stuff you Need to learn to Speed Up iPhone 6, 6 Plus, 5S, etc. As time passed by, a smartphone can become slower and slower, be it an Android phone or iPhone. Many reasons exist producing slow iPhone, including operation system issue, little space for running, inappropriate settings, etc. Every iPhone user could encounter this case. If you wish to start using a nippy iPhone, you need to understand the best way to improve iPhone. This article deliver comprehensive tips & tricks to speed up iPhone 6, 6 Plus, 5S and older iPhone devices, like 4S, 4, 3GS. 1. The way to speed iPhone: go out open apps It could possibly make a difference by double-hitting your house button to close all open apps. 2. How you can increase iPhone: restart your iPhone Most people would prefer to keep iPhone on night and day. However, it can be proved it is necessary to restart iPhone regularly. Shutdown might help iPhone extinguish some tough applications.