Are cell phones harmful even if you don't use them much?

I know there's a lot of questions like this one out there and I recently commented on one, but I don't use my cell phone very often and with all the different opinions about cell phone usage and cancer, I figured I'd ask anyway. I think last month I used a total of 12 minutes on my phone, but most of the time's its in my pocket and I generally forget its there. If not in my pocket, I have it under my pillow during the night because I use the alarm function and if I leave it out somewhere else its really loud and wakes up other people (I have 2 pillows on my bed, but its under the one I don't rest my head on). Sometimes I leave it there for days if I don't go out of the house (or I just forget its there) and eventually the battery dies and I have to recharge it. Bottom line, is that healthy?