Likewise for UK mobile numbers and for

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Do write +44 20 7890 7890, and do NOT write 011 44 20 7890 7890, because other users may have to use 00 44 20 7890 7890 or something else. Do write +1 303 890 7890, and do NOT write 00 1 303 789 7890 because other callers may have to use 0015 1 303 890 7890 or something else. National Numbers If you're writing your telephone number for a domestic audience, E.123 says to include parentheses around the area code only if that area code may be optional for some callers.


London, UK needs (020) 7890 7890 and California email database uk needs (415) 789 7890. This correctly signifies the area code does not need to be dialed when calling from within the same local area. Now that 10 digit mandatory dialing is in operation in Pennsylvania, you need to write 610 789 7890 without parentheses. To make it obvious the number is located in the US, writing 1 610 789 7890 or +1 610 789 7890 might be even more clear.

03xx and 08xx customer service and 'call-centre' numbers the code is not optional, so 07700 900555 and 0300 555 7890 and 0845 789 7890 are the correct formats to use. Final Note While this isn't exactly an 'SEO' tip, it is certainly another important factor in the running of many businesses. It's hard to measure the effect, but failure to fix it will surely lose sales opportunities. I have enjoyed reading a long succession of tips on this site.