The plugin will facilitate your production. It uses the 'HTTP_USER_AGENT' to choose the theme for your site.

'iPhone', // iPhone 'iPod', // iPod touch 'incognito', // iPhone alt browser 'webmate', // iPhone alt browser 'Android', // Android 'dream', // Android 'CUPCAKE', // Android 'froyo', // Android 'BlackBerry9500', // Storm 1 'BlackBerry9520', // Storm 1 'BlackBerry9530', // Storm 2 'BlackBerry9550', // Storm 2 'BlackBerry 9800', // Torch 'BlackBerry 9850', // Torch 2 'BlackBerry 9860', // Torch 2 'BlackBerry 9780', // Bold 3 'BlackBerry 9790', // Bold Touch 'BlackBerry 9900', // Bold 'BlackBerry 9930', // Bold 'BlackBerry 9350', // Curve 'BlackBerry 9360', // Curve 'BlackBerry 9370', // Curve 'BlackBerry 9380', // Curve 'BlackBerry 9810', // Torch 'BB10', // BlackBerry 10 devices 'webOS', // Palm Pre/Pixi 's8000', // Samsung s8000 'bada', // Samsung Bada Phone 'Googlebot-Mobile', // Google's mobile Crawler 'AdsBot-Google' // Google's Ad Bot Crawler