The spine has two natural curves that you need to maintain called the 'double C' or 'S' curves.
Currently I maintain cell phone calls fine there with my iPhones and with other cell phones, although this exact area used to drop AT&T calls reliably, a few years ago.
In use, power control algorithms automatically adjust the transmission power to maintain call quality, maximize system capacity, and extend battery life.
Telemarketing Merging, cleaning, and maintaining calling lists; subsetting lists (or markets); tracking and forwarding leads; ranking prospects; and prompting scripts (sales, customer service, and support).
I maintained a weblog, called My War, chronicling my experiences as an Infantryman while I was in Mosul.
I don't know if it's Infinity Ward or Activision subsidiary Raven that have been maintaining Call of Duty 4 online, but it still runs like a dream.
In mobile network systems, assigning a channel to a call in a cell in order to achieve high spectral efficiency is crucial to maintaining call quality and reducing call blocking.
Gallup, for example, maintains call centers in Nebraska, and PSRAI's main calling facility is located in Stafford Virginia.
Well, for a while there I maintained a conceptual Tumblr blog called The Printed Internet.
In the calling tactic, males maintain a calling territory and produce calling songs regularly to attract conspecific females.
Under this approach, called a castle-guard system, some knights were required to maintain buildings called "houses" within the castle itself, in the outer bailey.
