Samsung SPH-M520ZSAQST - Manual (Page 59)

Section 2A: Phone Basics 33
Phon
e Basics
Making and Answering Calls
Holding Your Phone
Since the antenna has been integrated into the design of the phone,
it is important not to block the reception path accidentally to ensure the
strongest signal possible is achieved. The orbital internal antenna is
located near the bottom of your handset (below the keypad).