Check if mobile number is valid in Rotterdam [closed]

I am not sure if this is the right forum to ask this, so sorry in advance if not. I am making a mobile application, where users can register with their mobile phone numbers.

The app is for Rotterdam only. I need to validate the form of the mobile number entered, but I do not know how a mobile number should look in Rotterdam for it to be valid.

I have a clue that it should start with +31 than 6 for Rotterdam and it should be followed by 7 digits.

Can you help me guys?

Best Answer

All Dutch telephone numbers have 10 digits, starting with the 0, (which falls away when you add the international number.)

So for a Dutch mobile number you will have +31 6 ABC DE FGH. Whereby the letters stand for the digits of the telephone number.

The 6 is for a Dutch mobile number, a Rotterdam land line number starts with 010, (so +31 10 AB CD EFG).

Made up numbers can be excluded by tests, sites have ways to check that you use a real number, like sending a text message asking you to reply or do something on the app.
Checking that the phone is in Rotterdam and nowhere else is much harder.
All Dutch mobile numbers and many foreign numbers can be in Rotterdam.
If it is possible to get a location from the network, which they can do if the phone is set to allow it, you could use that. Or you could ask the phone owner to enter extra details which show (as far as you can confirm) he is in the city.

PS, the spaces I put in the numbers are for reading only, while dialing you keep the numbers following, no spaces.

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How do I get a Dutch mobile number?

In order to get a Dutch phone number and a phone contract at one of the communications companies in the Netherlands, you need to have the following:

A valid ID/PASSPORT (if you are an EU/EEA citizen),

A Dutch resident permit (if you are a citizen outside EU/EEA)

Your BSN Number.

A Dutch Bank account.

A local home address.

What is Netherlands mobile number?

Telephone numbers in the Netherlands.

C# Validation: Validating a Mobile Phone Number

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