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00 = commonly used international access prefix

+1 = telephone country code for North America (USA, Canada, etc.)

403 = area code for Calgary, Alberta, Canada

or,001 = international access prefix

+40 = telephone country code for Romania

3 = operator code for competing telephone companies

It is much less confusing to quote an international telephone number beginning with the plus symbol and country code, omitting any access prefix, since the prefix varies from country to country.

(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)

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10y ago
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