Invalid UK Phone number formats according to Alternate validation library / Ofcom

[luke-hill]

Describe the bug

Faker::PhoneNumber.phone_number_with_country_code produces invalid phone numbers for the UK

To Reproduce

Produce a phone number as specified above. Some of the formats are not valid or conformant to what other library / validations stipulate

Expected behavior

Any time I call Faker::PhoneNumber.phone_number_with_country_code I get a valid UK phone number

Additional context

Ofcom link: https://www.ofcom.org.uk/phones-and-broadband/phone-numbers/numbering-data
Validation issue I raised: giggsey/libphonenumber-for-php#726 (comment)
Problematic phone numbers are also contained (Non-exhaustive), on that issue raised in the php tracker. They pointed me to look here
Faker ref: https://github.com/faker-ruby/faker/blob/main/lib/locales/en-GB.yml#L98-L113

[luke-hill]

NB: The failure rate for using this method was around 30%. When using the cell phone I was getting a 100% success rate. I would suggest adding more granular options OR adding more restrictive (And less random), options.

[thdaraujo]

Hi, @luke-hill.

Faker doesn't guarantee that all phone numbers generated will be valid, and we don't plan to support generating numbers that would pass a check from a phone validator library such as phonelib, for example.

See this comment for alternatives:
#2898 (comment)

We would be open to a PR that tweaks the format so that it would generate a lower amount of invalid numbers, but we can't guarantee that all of them will be valid.

[thdaraujo]

partially fixed by #3136