Samsung A900M - Manual (Page 55)

Section 2A: Your Phone: The Basics 31
Phone 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 along the
bottom portion of your handset.
Internal Antenna
Correct Hand
Position