it shows that “Trial accounts must verify a phone number before purchasing a Twilio number.”
Enter your personal mobile no. to get verified and then it activates the Twilio account and no.
You have to add your phone number and verify it first before choosing the Twilio number.
Go to Dashboard there you will find verified numbers in yellow highlight, press it first give ur number and verify. Now choose a Twilio number.
Once you have verified the email associated with the Twilio account, move on to verify a phone number. Enter the phone number in the provided space and click ‘Verify’.
Enter the verification code recieved on that phone number and click ‘Submit’
After verification, go to the Dashboard to get the Trial phone number. Click on ‘Get a trial phone number’.
On the pop-up, click on ‘Choose this Number’.
The Twilio phone number will be visible below the Auth Token. For Trial account, you can have only one Twilio number.