By AP technology writer
updated 4/16/2008 3:34:00 PM ET 2008-04-16T19:34:00

Q: I'm heading to Europe this summer, and I want to bring my cell phone, but international roaming looks expensive. How do I keep costs down?

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A: When in Rome, do as the Romans do. Switch out your SIM card — the little chip in the phone that carries your account information — for a prepaid local one, and pay local rates.

Don't be intimidated by the prospect. The SIM card, or Subscriber Identity Module, is almost always located in the phone's battery compartment. You'll probably have to remove the battery to get at it, but you don't need any special tools. If you can't figure it out, get a European to show you — they're used to switching SIM cards when they switch carriers.

You do need to do some homework first, but it's worth it, unless you're just staying in the foreign country for a few days. U.S. carriers generally charge about $1.29 per minute for international roaming, while local prepaid rates are around 20 U.S. cents per minute for outgoing calls, and incoming calls are free.

There are a couple of hurdles here, though. For one, not all U.S. phones work in Europe because of differing radio frequencies and technologies. The chance that your phone will work are best if your carrier is T-Mobile USA or AT&T Inc., but check your manual or the carrier's Web site to see if you have a "world phone."

Except for a handful of models, Verizon Wireless and Sprint Nextel Corp. phones don't work in Europe (and don't use SIM cards), but do work in parts of South America.

If you do have a "world phone," it still has to be unlocked for it to accept a SIM card from another carrier. Contact the carrier: It may give you the code to unlock the phone. Otherwise, an independent cell-phone store may be able to do it for a fee.

Putting a local SIM card in your phone means you're now using a local number. The good thing about this is that locals can call you cheaply, instead of dialing your U.S. number. The downside is that people calling you on your U.S. number won't reach you, just your voicemail.

Of course, there's a way to deal with this as well.

Most U.S. cell phones can be set to forward calls to another U.S. number, but they won't forward overseas. To get around that, set up an account with a Web site like TollFreeForwarding.com. It gives you a U.S. toll-free number that will forward to an international number for $10 a month, with about 90 minutes of talk time included for calls forwarded to Western Europe. Then, set your phone to forward to the toll-free number (ask your carrier for instructions). Incoming calls will bounce from your U.S. number to the toll-free number to the overseas number.

Now, you may complain that all this is a bit complicated. There are services that take care of the details for you, like RangeRoamer and Call in Europe. You can buy or rent a world phone from them before your trip, complete with a SIM card. The prices aren't quite as low as local SIM cards, but they're better than roaming rates.

Both services will also help you set up forwarding from your U.S. number to the overseas phone.

Lastly, remember to turn your phone off when you go to bed! U.S. callers may have no idea it's 3 a.m. in Europe when they call you to chat at 9 p.m. Eastern time.

Copyright 2008 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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