Usually when you create a Gmail account – if you don't give phone number, it will ask you for verification code as well to prevent spam.
There is a simple trick that makes it possible to register without phone verification.
4 steps for a gmail account without phone number:
Step 1 - Go to your play store
Just open your play store and follow next step.
Step 2 - Use YouTube app
Download YouTube app from the play store.
Step 3 - Create your Gmail!
Open you Youtube app (NOT! the website) that you downloaded in step 2, and create from there your Gmail account.
The final step - Just skip the verification
And it's all.