Most Helpful Girl
STEP ONE: Decide what you want to say and prepare for voicemail message if necessary
STEP TWO: Pick up the phone
STEP THREE: Dial her number
STEP FOUR: A) Allow the appropriate amount of rings. B) If call goes into voicemail leave prepared non stalker-ish/ guilt-tripping message.
STEP FIVE: A) If call answered conduct pleasantries but get right to the point. This is your ex if you're calling she knows you want something the question is what. B) If call went into voicemail after leaving the previously mentioned message, HANG UP THE DAMN PHONE! Do not proceed to call again for the day unless it is an emergency that somehow involves said ex.
Remember you called her so try not to have too much of lag time aka awkward silences. If this is too much for you to handle (not trying to be condescending) try a text message following the same principle. GET RIGHT TO THE POINT but be polite.