How do I call a 1 800 number from the UK?

Calling North American Toll-Free numbers from the UK

If you have ever tried to reach a North American business using a toll-free number from across the pond, you might have run into a brick wall. Standard 1-800 numbers do not work when you simply pick up a UK phone and dial them directly.

The secret to bridging the gap lies in understanding international prefixes and country codes. North American toll-free numbers come in a few familiar shapes—starting with 800, 888, 877, 866, 855, 844, or 833. To dial one of these from the UK, you need to add the United States country code (+1) before the number.

Here is the exact formula: dial +1, followed by the 800 prefix and the remaining seven digits. On a mobile phone, holding down the zero key will typically generate the + sign, or you can use the standard international access code 00 instead.

Keep in mind that while these numbers are free for callers within the US and Canada, calling them from the UK is not free. Your UK network provider will charge standard international calling rates for the connection, so it is always a good idea to check your carrier's pricing before making the call.

Conversely, if you are ever calling a UK 0800 number from abroad, the rule flips: you drop the leading zero and dial +44 800 followed by the rest of the digits. Knowing these simple prefix rules makes connecting across borders effortless.