CK: How To Protect Your Phone From Foreign Calls

T-Mobile charged him for the two hour call. He says he doesn't know anyone in Bosnia and never called there. So how does this happen?

"I was just thinking in the back of my head, there must've been some mistake or type of error," says Mark Saepharn, Sacramento resident.

Mark says he doesn't owe 180 bucks for the121 minute call to Bosnia the night of July 24th, an international call he says he never made.

"Never out of my possession. I always have my phone with me," says Mark.

When Mark disputed the charge with T-Mobile, they wouldn't back down.

"It could just be a billing mistake on the part of the carrier... The thing that raises a red flag is the call is actually to Bosnia," says Kent German, Section Editor, CNET.

German says a lot of fraudulent calls pop up on bills involving countries in Eastern Europe and Russia.

He also says a crook could've gotten a hold of Mark's SIM card number.

"It is possible for someone to take that number, put it on another phone, it's called cloning in this case and then make a call and then it would be charged to your account," says German.

So can you block international calls from your cell phone?

All the major carriers say yes. For T-mobile: just call customer service. Verizon: go online. AT&T: you can block international calls, if you go in the store or call up. And for Sprint: most international calls are already blocked.

T-Mobile wouldn't discuss Mark's case with us, citing privacy policies but in an email, say:

"T-Mobile has looked further into the issue with Mr. Saepharn's account and has made changes to come to a resolution with the customer."

Mark says he never got a call from T-Mobile but his online account reflects a $180.29 credit.

"I don't have no business calling international," says Mark.

If you can't resolve a dispute with your cell phone carrier, you can file a complaint online with the Federal Communications Commission.