For starters, big box outlets such as Blockbuster have been driven out of the bricks and mortar video rental business to seek salvation online. For most of us, our video stores are nothing more than corner convenience stores with a few hundred movies on hand at any time. Space is at a premium for these guys so they can only afford to have a few copies of new releases along with a smattering of older movie rental titles on hand at any time. It's a bit frustrating to drive out only to find the movie you had your heart set on is always out.
If the other person says that they can only be called on their mobile phone or that they don't have a landline phone number then that could be another signal. In today's age, there are people who genuinely do not have landline phone numbers, relying on mobile phones and Skype.