Choose a mobile carrier or VoIP provider
Sign up for a new account
Select a new phone number during setup
Verify your identity if required
Activate the SIM...
Check the caller ID or voicemail
Search the number in a search engine
Use a reverse phone lookup website
Search the number on social media
Check messaging apps...
Check the contact list on the phone
Search the phone’s settings for the device number
Look at the SIM card packaging or carrier account
Check old messages...