If you need assistance registering for PikMyKids without a cellphone, you can contact them at support@pikmykid.com or (813) 864-7627 (Thanks to Eric Blask for the info)
If you want to sign up for free Google Voice number so you can register for PikMyKids or for any other reasons, Sae Park is offering his assistance.
With Google Voice, you will get a real phone number that you can receive text messages (sorry no pictures).
Please contact Sae Park at saepark@gmail.com if you are interested.