PhoneMax Amplified Telephone
I've used this phone for about a month now and I think it's going to be a great purchase.  I had an old GE amplified phone that was inadequate for my hearing.  I guess it amplified the volume by maybe x2.  Also, it had some features that I rarely used.  As my hearing got worse I decided to get a new phone.  I selected the PhoneMax because it had a standard ringer as an option - I learned by reading other reviews that the Clarity phones (the other option I was considering) only had an amplified ringer (i.e. loud).  The phone seemed to have the big feature I needed - more volume.  It does have a lot more volume.  One possible caution: I think the advertisements say it's got 40 dB amplification, open the users manual and it says 25 dB (as I recall).  I don't think the phone delivers 42 dB amplification, but it probably can deliver at least 10 dB and possibly 25 dB - it probably has more than enough for you unless you really, really, really have a hearing problem - I wear hearing aids when I have to, but most of the time I can get by without them, and the phone can supply very much more volume (x10) than I need if I turn the volume all the way up.  One other feature is that it amplifies the high frequencies more than the low, so voices sound different on the phone - but you'll likely still be able to recognize who you're talking to.  The ringer has 3 levels, off, lo, hi, and also 3 tones (I, II, & III).  The volume control is a simple analog rotary dial on the front of the phone - easy to access and easy to change.  The phone, and all comparable amplified phones, were kind of costly, in my opinion; on the other hand I think I'll get good use from it for at least 10 years - maybe longer.  I recommend it.  Not a lot of bells and whistles, just what you need.
Rating: 5 stars