Hi. I'm online and happy to answer your question today.
First of all, using a cell phone is not going to cause any problems with your eyes at all.
It can not cause visual field loss and I, personally and professionally, do not believe any of the statements that it causes brain tumors or any of that other junk.
Can you tell me more about this peripheral vision loss you had in 2003? Have you had any repeat studies? Have you had any abnormalities found during an eye exam by an ophthalmologist?
I see that you are offline. I'll switch over to the Q&A system. This system works a lot like 'text messaging' but an email is sent to each of us anytime something is posted to this thread. We can continue to work on your question there..... :)