I have a PB account, I also have a Drop box (which is specifically advertised as being able to upload over cell service) the problem is where we live no hi-speed ISP's exist so were stuck with our 3G cell service. I don't have the abilit to upload photos... Good suggestion tho, trust me I know how much quicker my sales/trading would be if I could post photos.
Make ote of the Exchange rules, section for sellers. It indicates that you need to post photos of your item. While we don't enforce this rule 100% of the time, it is still considered an important component. Personally, I will not buy any item without seeing a picture first. We have recently discussed the necessity ofposting clear, well lit photos of the actual item, no matter how common in a sales or trade thread.
Taking a photo, resiting it and uploading it to a hosting site is very simple to do, regardless of broadband availability or not.