I'm using the belt and braces approach, configuring all viewport settings available, as per developer.android.com's Targeting Screens from Web Apps
The following syntax shows all of the supported viewport properties and the general types of values accepted by each one:
<meta name="viewport"
content="
height = [pixel_value | device-height] ,
width = [pixel_value | device-width ] ,
initial-scale = float_value ,
minimum-scale = float_value ,
maximum-scale = float_value ,
user-scalable = [yes | no] ,
target-densitydpi = [dpi_value |
device-dpi | high-dpi | medium-dpi | low-dpi]
" />
The configured meta tag for no zoom:
<meta name="viewport"
content="
height = device-height,
width = device-width,
initial-scale = 1.0,
minimum-scale = 1.0,
maximum-scale = 1.0,
user-scalable = no,
target-densitydpi = device-dpi
" />
And as a one liner:
<meta name="viewport" content="height=device-height, width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no, target-densitydpi=device-dpi" />