I changed it up a bit by putting an 8x4" piece of white cardstock in backwards so that the card opening is from the inside, rather than the outside. I liked that better than a simple piece of white cardstock which really doesn't give one anywhere to write!
Anyway, the phone booth card is from Artfully Sent, one of our wonderful Cricut cartridges.
The phone and "hello" are from the Share the Love stamp set (only available this month, $7 of which goes to the Operation Smile charity).
Share the Love stamp set
White cardstock cut at 8x4, scored at 4", attached so that opening is towards the inside
Have a wonderful day!