I went in this past Tuesday with my T-Mobile note 3 that needed the glass and the LCD replaced.  I've NEVER been to this business before nor any like it.  I've always taken great care of my smartphones.  A friend's child threw a rock hitting my phone hence the need for the replacement.  The guy at the store told me that they would have to order the specific part for my phone since the one they had in stock was for the AT&T version only.  He told me 3-4 business days so my plan was to go in Saturday morning to get it fixed.  I just called the store and some other employee told me that no part was ordered for my phone and that I had to have either left my phone with them as collateral or pay half of the $300 service fee up-front.  I would have gladly put half down when I went in on Tuesday but I was NEVER TOLD that I had to do one or the other.  WTF?!?!  I didn't realize that it was my responsibility to know their rules!!