Opera is currently in more than 100 million users worldwide. With the current version of the opera is in the 2-option, the Opera Mobile and Opera Mini. The difference is that Opera Mobile Option rendering web pages, without the compressed Opera server, as you probably know that allready Opera Opera Presto / Opera server with web pages before they compress to users cell phone.
For example, if you URL are given to address the actual size of these pages 100kb, 100kb instead of the whole web pages, Opera server reduces the size to let say 10kb. The advantage is that it be faster to compress this page to user's mobile and cheaper to load, while the disadvantage is that users do not get the whole experience into the Web page as it was. With Opera Mobile, you have the option in the settings to disable the compression process and present the entire web pages. This would be helpful if you have an unlimited data plan for your phone.
Opera is for almost all types of mobile phones, Opera can be downloaded free of charge by clicking m.opera.comavailable mobile phone installed with your browser and Opera will detect your phone model and automatically selecting the correct version of Opera for your phone. If you prefer to download Opera browser on your PC you can go opera.com and select it yourself.