Heh... my difficulty there comes in the fact that my phone goes down to the cheap minutes (52 hours compared to six for peak times per month) at 8:00 PST. Which means if I want to call someone on, say, the East coast, it's either at 11:00 at night, or on the weekend.

So my mom gets random calls from me around 9:00me/10:00her, but other than that I use the same general rule.