The t-shirt that lets others know that your phone is feared by Telemarketing scammers the world over! White on Black or Black on White.
Hanes Ladies Nano-T Cotton V-Neck T-Shirt. Front side is the classic Jolly Roger logo.   Back has the hashtag/slogan "#Deep6Telemarketers".

4.5 oz, 100% ring spun cotton
Stylish mitered V-neck
Contoured and side seamed for a classic feminine fit
Double-needle sleeves and hem