Originally Posted by
weekilter
Are you aware that on GSM systems if someone calls you and your call rolls to voicemail you'll get charged for two international calls? One to try and find you in your foreign location and the other for the trip back to the US to deposit the voicemail in your voicemail inbox.
I was about to post the same thing. I always hard forward my phone number to Google Voice when jumping on a plane. Many years ago, I had a a $20 voice mail in Tanzinia (counting the retrieval). Conditional call forwarding which happens when you don't answer or decline a call adds up quickly.