No pun intended - we really like to have things ... new things. Things we may not even totally understand - but better we have them, than someone else, right? Well this is a special case - we do not know where the two main characters are living, how they find the cell phone ... how it got there and many other things that seem at least strange and remain without answer.
All that said, what we do know, they never had something like this in their hands ... and yet, they learn quickly ... but sharing (not cloud stuff or social media mind you) is not really on the menu ... or on display to add another pun ... well acted and even better shot ... I can only imagine how crazy it was to make a shooting script and story board ... but they managed it to say the least.