I found this website useful. http://www.handsetdetection.com/ It is free upto 10000 detection.
Sign up an follow the instruction to create your javascript. It will detect the visitor’s mobile and redirect to other website.
I created the following html and uploaded.
<!DOCTYPE html> <html> <head> <script type=’text/javascript’ src=’http://www.handsetdetection.com/sites/js/yournumber.js’></script> </head> <body> <h1>You are accessing from [...]