Convert to E164 only if possible?

Question

Can I determine if the user entered a phone number that can be safely formatted into E164? For Germany, this requires that the user started his entry with a local area code. For example, `123456` may be a subscriber number in his city, but it cannot be formatted into E164, because we don't know his local area code. Then I would like to keep the entry as it is. In contrast, the input `089123456` is independent of the area code and could be formatted into E164, because we know he's from Germany and we could convert this into `+4989123456`.

Accepted Answer

You can simply convert your number into E164 using libphonenumber and after conversion checks if both the strings are same or not. If they're same means a number can not be formatted, otherwise the number you'll get from library will be formatted in E164.

Here's how you can convert

```
PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
String formattedNumber = phoneUtil.format(inputNumber, PhoneNumberFormat.E164);
```

Finally compare formattedNumber with inputNumber

Convert to E164 only if possible?

Solution

Problem