Most US, European and other developed countries' cell phones work internationally therefore allowing you to make and receive call, retrieve emails and browse the web. In general, almost all T-Mobile, Vodaphone and AT&T cell phones work internationally but (in the US) most Verizon and Sprint handsets will not work. In any event, there are many more budget oriented options than “roaming” with your current carrier when going abroad.
Broken down into two categories you have: one for international data and one for international cellular service.
International Cellular Service

US and European carriers
charge anywhere from $1.00-$5.00 (plus tax) per minute for international
roaming for all calls in and out. In general, Western Europe is on the lower
side of the spectrum while Asia, Africa and
Another approach to getting a SIM card,
although more expensive than buying one locally, is to purchase one online
prior to your departure. The advantages are several. The most evident are
that you have the product and corresponding phone number in hand prior to
your trip and second, the instructions will be in English as opposed to the
local language. Lastly, many of the SIM cards available in the
If you are traveling to more than one country
(backpacking through
International Data
International data can be
enormously expensive, especially handsets like the iPhone that are
constantly updating. The best piece of advice is to do your homework before
you depart and find out where free wifi is available, turn off the data on
your handset and just use wifi for emails and web browsing. However, this
can be impractical, particularly for those who need immediate access or are
not traveling to major cities.
Currently, the only exception regarding high data roaming fees is if you happen to have a Blackberry phone and happen to use T-Mobile as your carrier. T-Mobile offers an email only international plan for just $19 per month and there are no activation fees nor minimums. Again, this is strictly for emails and does not include web browsing which is still painfully expensive with T-Mobile.
If you absolutely need to have access to the internet
at all times, your best bet is to use a local carrier’s service or, if
traveling to multiple countries, a roaming solution that is data enabled.
One Country Travel
If your travel plans are limited to one or
two countries, your best bet is to get a local prepaid SIM card with a data
plan. While prices vary from country to country, most countries in Europe
charge approximately $30-$40 for unlimited use or almost unlimited use
(there is usually a cap at some point, for example, with most carriers in
Italy it is 10GB). If you have an iPad or a
smartphone, you can get a SIM card with the data plan. Based on personal
experience, while this is by far the most cost effective approach, it is
certainly not the most stress free (he most stress free is to roam with your
current provider by the way – stress free until you get your roaming bill
that is). You may have an issue explaining exactly what you want to do or
have problems understanding the offering or having them added to your SIM
card. So, while this does entail a bit of effort, it is definitely worth it.
If you have multiple devices, such as a PC, iPad and/or cell phone or are
traveling with another person who needs internet access, a fantastic
solution is to get a mobile hotspot device such as the MiFi or the Huwawei
E585. While you still need a SIM card with a data plan, a mobile hotspot
device will create your own personal hotspot capable of allowing up to 5
users or devices at the same time.
Multi Country Travel
If you
are going to 2 countries or staying in each country for a couple of weeks or
more, the above recommendation is still the best approach. However, if you
will be traveling to several countries within a short time span, spending
your time getting SIM cards probably doesn’t make much sense.
Many
US
providers do offer something in terms of international data packages. The
problem is, when you consume beyond the allotted amount in the package (ex.
$100 for 250mb of international data), the rates balloon up to ridiculous
rates. An alternative is to use a roaming SIM from an alternative provider.
While still expensive, the rates are fractions of the large telecoms. The
National Geographic Travel SIM has decent rates for international roaming.
In sum, with a little bit of effort, you can save huge
amounts on cellular and data service. The most convenient approach, and
probably what Donald Trump uses, is to just turn on your phone just as you
would in the United States. The most cost effective is to wait
until you get to where you are going. This approach is definitely not for
everyone. The in between approach, which can be less expensive than blindly
trying to find just any carrier overseas, is to use purchase or rent the
service prior to your departure.
With thanks to
Sebastian Harrison - Cellular Abroad, Inc.
"The best thing about travel is that feeling of total confusion without rejection"