my grandson has forgotten his password. he uses my phone number as his number. I put in his id then forgot password and it asked for phone number but no notification came or message. How do I get his phone working

Hi MawMaw1012, thank you for posting in Apple Support Communities.

The following link explains in a lot of detail the methods available to reset an AppleID password:

https://support.apple.com/en-au/HT201487

You can also use this link as well:

https://iforgot.apple.com/password/verify/appleid

You can also contact Apple Support as follows:

• Online:--> Genius Bar Reservation and Apple Support Options - Apple;
• Contacting a local Apple Store or AASP among the list provided above but also again as follows Apple – Location Selector; or
• Using the "Apple Support" app, available and downloadable from the App Store.

Try the steps on this Apple page:

Additional Support - Activation Lock