Phone number validator
A quick sanity check before you paste a number into a sign-up form.
How do I know if a phone number is valid?
It must start with a recognized country code and have the number of digits that country uses for mobile numbers (10 in the US and India, 10 after +44 in the UK, 11 in Brazil including the area code). This tool checks both; it does not tell you whether the line is active, only whether the shape is right.
Start with + and the country code.