9) Test, Test, Test
However you or your designer build a website, there is only one way to know if it has been optimized for mobile devices – physically check. You must not assume that everything works on all devices; you have to test if that is true. Test on various mobile devices at each stage of the design process and encourage friends, family, and employees to do the same. It is very easy to miss something. There are bound to be anomalies, but they can’t be addressed if you are not aware of them.
Constant testing needs to carry on even after the site is live. The technology of hardware and software is changing all the time; what works today may not tomorrow. Don’t assume everything is okay, test. There is a new iteration of every mobile phone each year, operating systems are constantly upgrading, and the only way to stay on top of the situation is by constantly checking and evaluating.