In the entire world, there are a total of 884 million fixed line (landline) subscriptions 1. In addition, there are currently 8.6 billion mobile phone subscriptions 2. The first assigned telephone number (which still exists to this day) is PEnnsylvania 6-5000 3. Note: The data for phone number quantities has been taken from the number of phone According to wikipedia, the maximum phone number length is 15 digitals. The code below implements the mask +00 (000) 000-00-00-000. Also, the backspace works as well. How to Change Android's SMS Limit. Set up ADB as outlined in this previous tutorial. Enter an ADB shell by sending the following command in the command prompt or terminal window: adb shell. Then To get max value you actually have to calculate the sum of 2^n with n from 0 to 31 or simpler 2^32 - 1 and you'll get '4294967295' as max for unsigned int, one less than anticipated. Now do the same with 2^31 - 1 for signed int and you'll get 2,147,483,647. 1. Form my point of view, below is my suggestions: Store phone number into a single field as varchar and if you need to split then after retrieve split accordingly. If you store as number then preceding 0 will truncate, so always store as varchar. Validate users phone number before inserting into your table. Share. MVC has built in support for telephone numbers: [DataType(DataType.PhoneNumber)] public string Phone { get; set; } See the MSDN reference page for more information on the validatation types available: DataType Enumeration. You should use this Validation to validate the Phone / Mobile Number between 9 - 11 or only 10 digits. If You are validating a string, You can use Laravel's 'size:N' rule: For string data, value corresponds to the number of characters. For numeric data, value corresponds to a given integer value. Replace minimal number of characters to make all characters pair wise distinct; Count of 1-bit and 2-bit characters in the given binary string; Number of strings in two array satisfy the given conditions; Maximum length substring with highest frequency in a string; Minimum number of additions to make the string balanced Telephone numbers in Belgium. A telephone number in Belgium is a sequence of nine or ten digits dialed on a telephone to make a call on the Belgian telephone network. Belgium is under a full number dialing plan, meaning that the full national number must be dialed for all calls, while it retains the trunk code, '0', for all national dialling UK landline phone numbers can have either nine or ten digits after the zero trunk code. The area codes always start with 01 or 02 and can be anywhere between three and six digits long. UK mobile phone numbers have a maximum of 12 digits, including the 07 area code. VNMC3IH.