Agreed! I hate when someone is helping me and then they walk away to answer a phone. So I get it, if I've got 20 people in the store I wouldn't answer the phone probably.
The holster it comes with has printed on the back "XDs 45acp/.40/9mm" which would lead me to believe a 9mm and .40 aren't that far behind.
I'll be all over that 9mm.