This white phone card features the lesser-used "Glove Pull" Sonic art. He's fully shaded/colored here, with a simple shadow for the all white background. "Segasonic" is written in large black letters down one side, with the copyright info at the bottom. It's a simple old card, but it's very plain-ness makes an impression.
Notice how the card is in a plastic sleeve, these do fit into collectible-card sleeves & cases to make collecing/sorting them easy while keeping them safe.
Notice the notches in the edges of all the cards. Inside pay-phone slots there was a sensor to fit these notches/be sure the card was placed correctly.