Support eBay Mobile App

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http://androidforums.com – I do not understand "mobile apps," but that is no surprise since I am new to "smart phones." Tried to log into my eBay account this afternoon using my LG Motion 4G phone, but I was unable to log in. Saw something on the site about a free "mobile app." Why would I need any sort of app to log into my account? I do it directly from my laptop with no problem. Why is the phone different? (General)