Apple’s servers expect a valid, properly formatted, real phone number tied to your country/region.
Example for India (Telangana region, based on your information):
+91
Thus, the system runs validation checks against the format and structure of the number entered, matching it against known valid patterns (E.164 format is often used internationally).
- Confirm that your Mac’s system region (Settings > Language & Region) matches the region of your phone number. Sometimes a mismatch between your Apple ID region and your provided phone number format can cause validation errors.
Additional Note:
If you do not want to link your primary personal number, you may purchase or use a secondary SIM or a VoIP number (where allowed). However, do note: some VoIP numbers (like Google Voice, TextNow) may not be accepted by Apple during ID verification.
Apple uses phone numbers for:
• Identity verification
• Payment method security
• Account recovery
• Purchase validation
It should be a number where you can receive SMS messages or calls, because Apple might send a verification code.