handphone for making extra money online?

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Which handphone is good for working online for example if we want to work on a ptc site? Most of the time,i am using laptop to work online thus i cannot do the work anywhere and anytime i want as laptop is not portable for me. I used Nokia E61i before, with this i can work with myLot but cannot with most ptc sites. Anyone is working online through a handphone? Thanks all.