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If you have international customers, you may want to add an international
code before your number, such a 1 for Canada or the USA, 33 for France, 44
for England, 41 for Switzerland, etc...
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You may want to secure all possible variations to your number such as
08008008000, 0800-800-8000 or 1-800-800-8000. Just consider where from your
customers will be trying to reach you and how the number might be entered in
their cellular. (In Europe, International calls start with "00", in the
USA/Canada with either "01" or "011", etc...)