Interrapt G34

Environment:
test
https://qainterrapt.brainster.xyz/login
Browser:
1.PC / Windows 10 V. 22H2 / Google Chrome Version 131.0.0.0 (Official Build) (64-bit)
2.Apple iPhone 11 / iOS Version 17.6.1 / Safari Version 17.6 on iOS 17.6 (Official Build) (24-bit)

Description:
By entering special characters such as hyphen (-) and plus (+) in 'phone' field is not accepted and message appears 'The phone must be a number.'

Pre-conditions:
User must be navigated to Interrapt application
User must be logged in as admin.

Steps to reproduce:
1.Click on "ATTENDEES" menu.
2. Click on 'CREATE' button from the top right corner
3.Fill the 'Name' field with valid data.
4.Fill the 'Surname' field with valid data.
5.Fill the 'Email' field with valid data.
6.Fill the 'Phone' field with valid data.
7.Fill the 'City' field with valid data.
8.Fill in the 'High school' field with valid data.
9.Fill the 'Faculty' field with valid data.
10.Click on the drop-down field labeled "Webinar."
11.Select a webinar from the available list.
12. Click on the 'CREATE' button in the bottom right corner.

Expected Result:
The system should accept the input, as these are valid characters in many phone number formats.
The phone number should be saved correctly without errors.

Actual Result
The system rejects the input and displays an error message (The phone must be a number.), preventing the valid phone number from being accepted.