The phrase "a primary device for" is correct and usable in written English.
It can be used to describe a main tool or method used for a specific purpose or function.
Example: "The smartphone has become a primary device for communication in today's society."
Alternatives: "a key tool for" or "a main instrument for".
Although temporarily abandoned by the FCC policy task force, the interference temperature model is still widely used among researchers as it provides an accurate measure at a receiving primary device for the acceptable level of RF interference in the spectrum band of interest [8].
Rather than constantly mocking iPhone and Android, we should encourage key decision makers across the board to use these products as their primary device for a week or so at a time — yes, on Exchange!
In the early '50s, a gas-filled cloud chamber was the primary device for observing debris from atom smashers.
But its role in regions like Asia-Pacific is especially a focus for the industry because in emerging markets, handsets become the primary device for accessing the Internet, instead of more traditional, larger-screened computers.
For most CAP commodities the primary device for achieving target prices is the variable import levy.
In exchange, RealNetworks would make the iPod its primary device for the RealNetworks store and for the RealPlayer software.
Going into this review, I had used an iPhone (which, for disclosures sake, I pay for in full) as my primary device for around 2 years.
Now, I am a man blessed with fairly small hands, and I've been using the much-smaller Nexus One as my primary device for years now.
As we had written last month, Ezetap is riding on growing mobile phone subscriber base in markets like India and Kenya, where more users are becoming comfortable with mobile as their primary device for online transactions.
