isMobilePhone en-US locale accepts non-NANPA numbers with country code

[DanielleB-R]

The en-US locale of isMobilePhone erroneously accepts some foreign numbers, if they are the correct length including the country code. +6425864074 is a (fake) New Zealand mobile phone number, and not a valid NANPA number, but isMobilePhone('+6425864074', 'en-US') returns true.

It appears that the regex treats the + and 1 at the beginning as separately optional, but the 1 is not optional for this locale after a +.

[profnandaa]

Thanks for raising, will check it out. A fix PR is also welcome 👍

[tolgaduzenli]

Any work on this bug ? is that coming with new release ?

[profnandaa]

@tolgaduzenli - a PR is welcome.