You need to configure that the mobile app meets the requirements for phone entries. Which expression should you use?
正解:D
When a pharmacy is added by using the mobile app, the phone number must be validated to be all digits. Note: The IsNumeric function tests whether a value is numeric. Other kinds of values include Boolean, string, table, and record. The return value is a Boolean true or false. Reference: https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/functions/function-isnumeric