On the front page at www.tello.com, first month of any plan is $4. Offer available until July 6. (Odd phrasing-- not sure it it goes away at the stroke of July 6, or through July 6).
New customer, new line. In the past, any new account works, and I have no reason to suspect it will be different.
Don't forget to drop by the referral thread in the forum & grab a referral code for 10 Tello dollars added to your account.