Cell Phone Signal Booster Sticker - As Seen On TV! ENHANCE cellular phones with sending and receiving signals. Captures stray radiation within the phone, re-radiates the signal to improve performance. ELIMINATES static interference and stops dropped calls. SIMPLE TO INSTALL, simply peel off and stick onto the back of your phone's battery. WORKS on analog, digital and tri-band phones. Fits all cell phones, PCS, cordless phones. NOT COMPATIBLE with any version of iPhone.