There is no area code 138 in North America (country code +1 = USA, Canada, etc.).
If you mean country code +1 and area code 38, you need one more digit:
Other countries may have domestic area codes like 138.
(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 many countries use different prefixes.)
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