Instructions for calling from the UK to international locations requires special calling codes that allow you to connect to countries outside of the United Kingdom.
Calling out to Slovakia
Here are the instructions on how to call the country of Canada from the United Kingdom.
To call Slovakia, dial 00421 and then enter the phone number of the person or location you’re trying to reach. If the phone number is displayed with a leading +421 omit the 421 and replace it with the UK international dialing code of 00. For example:
Phone Number in Slovakia
Dialed from the United Kingdom
+421 x xx xxxx
00 x xx xxxx
2 16 7765
00 2 16 7765
How to call the UK from Slovakia
To call a landline or mobile phone in the United Kingdon from Slovakia, dial 00 44, then dial the UK phone number, minus the leading zero. For example: