Mobile purchasing is becoming increasingly common, with 21% of those aged 25-34 having made a purchase from their mobile phone. A survey found that 79% of respondents felt comfortable paying for purchases online via their cell phone. While most mobile purchases are currently under $100, 50% said they would spend over $100 and 20% over $500 using their cell phone. Analysis found that iPads and iPhones accounted for over 92% of non-desktop online retail sales in December, up from 88% eight months prior. Mobile devices are most used for shopping when desktops are not readily available, such as during holidays or weekends.