How to call London from the us?

I Have to call someone in London, I'm currently in the states, so I googled tt and it says to dial 011 44 20 + the number I'm trying to reach, do I did! It's says I have 5 hours for this call, then I connects me, but I expect to hear a ringing tone, but stead I just hear a nipping sound like its busy! Anyone know what I'm doing wrong? I'm using my iPhone 4s? FYI

Typical number would be 011 44 208(or 7) 543 1122 just substitute your numbers

If you're calling a London landline from the US you'll need to dial the US international prefix 011, then the UK country code 44, then the London prefix (0)20 followed by the landline number which is 8 numbers long beginning with either 3, 7, or 8.
So the number you need to dial will look like this: 011 44 02 xxxxxxxx
The UK ring tone is two short rings, followed by a short pause, then repeat.

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