Cell phone dieting: Weight loss support that can fit in your pocket

Everyone has a cell phone these days -- what if you can use it to help you stick to your diet program? Here are a few cell-phone diet gizmos that you can use to keep on track--courtesy of WebMD:

• Food Phone Here's how it works: when you want to eat something, take a quick cell-phone picture of it and send it to the Food Phone people. A diet coach will text back with either a thumbs up or thumbs down, as well as suggestions for how to make it healthier. For $149 a month, you can sign up to this service, though that seems a bit steep to me.
  
• Cell Phone Diet Coaching For about $7, you can download a 'diet coach' application to your cell phone that will help you stay on track while losing the weight. Talk to your phone provider for programs available.
  
• Fitness Phone Nokia makes this phone and it has a variety of fitness-related utilities, like a calorie counter, a scheduler and more. It will set you back about $200 plus service fees.
  

What do you think of these? Worth it, or a rip off?