Another one you might try is having a greeting card sent to your house if you are still living together. Have someone else write out the address and leave the return address blank. Picking a card with a brightly colored envelope will draw more attention.
If you're calling a spouse with caller id, dial *67 first, then the number. The caller id will be blocked and they will not know where you are calling from.
Laurie, thanks for your help Friday! R hasn't given me a date yet for her weekend.