when you guys catch up on the phone id slip in some dirty talk into the convo after letting her know how much i was thinking of her and its fun
. Just reassures her and normally puts her in a state of arousal which is great for when you get back
stoke the fires while you're gone so they're still hot and all that. Again its not JUST to get her horny it really solidifies a connection when you're long distance but coming back soon. Example
GF- "hey babe hope i didn't wake you the other night"
Me- "you were as quiet as a mouse!"
GF - "yeah i was on my tippy toes"
Me- "...mmmm the thought of you on your tippy toes god i can't wait to come home
" said while chuckling.
Just an example. Again the idea is to let her know you are thinking of her and not just in a .."yeah shes cool" kind of way. But dont sound desperate haha, and if you can't find a way to slip some dirty talk in the convo just straight up say it using a question
you - "hey babe where are you?"
Gf- "oh im at such and such"
You - "thats so weird, i actually had a dream about us ....in a place like that"
Gf - " us what?"
You - " it was pretty intense i better not talk about it on the phone...long distance charges and what not"
....keep teasing her and then just make something up, but have fun.
Be careful of mentioning other women!!! even if they are co-workers...just refer to them as that "co-workers" on the phone she is the only woman!
Really hope that helps man...its what has worked for me so i hope it helps you