I never found out the size, but, I was able to get some replacements. I went to the local electronics recycling center to see if they had any. They did have a screw that was the right size which they installed and just gave me. The thread and length are the same, but, the head takes a three bladed screwdriver instead of a torx driver. So far I haven't been able to find a precision screwdriver set with this blade. I also found a set on ebay. I think it was about $4 for the set, which is very high for such little screws, but, on the other hand is not very much so I bought them.
I still would like to know the actual sizes this and other phones use.