I know exactly what you're talking about! I'm now suffering from the exact same issue and unfortunately I cannot help you with any options of treatment. However I came here with a diagnose and maybe someone will find it useful. Well I got that ear pain from cell phone use few years ago but slowly slowly my problem was growing and I was ignorant about that so now I cannot use any kind of phones. Each time I need to talk to someone I either use skype or put the phone on loud speaker. When it first occurred the pain wouldn't start unless I spoke for more than about 10 minutes in row then my time went down to 5 minutes then it started just within a minute until it is so bad that I cannot talk now few seconds without pains. It doesn't matter the phone type: landlines or regular phones, they all are having the same effect on my ear.
I don't know if this problem is somehow connected to what I was suffering a year ago but there is a possibility: a year ago I was having big troubles with sleeping and I was very anxious 24/7. Now these problems vanished but the ear ache I get is still there. Of course I went to several doctor asking them about this and being sure (first few weeks of searching) that I will get my answer about how to treat it very soon, it seems that it was very wrong. However all they told me that everything is fine with me and they cannot find anything physical wrong with me and they all blamed it on my anxiety. Knowing that this is not the reason of my problem I have done a ton of research and I diagnosed myself with electromagnetic sensitivity. Not being a doctor I cannot say that for sure but it's the only logical diagnose. Basically this means radiation sickness. I started to have it because my body was overloaded with radiation because I was exposed too much on it. I am sick to any electro magnetic fields and I have to avoid using any kind of electrical appliances. I would recommend anyone who is suffering from this problem to turn off all home wi fi networks and cordless phones and to avoid as you can electromagnetic objects. Don't sleep near your telephone, laptop and anything what is plugged in. These things won't make you able again to use phones but you won't make it all worse. And who knows? maybe in time you're going to regenerate yourself. Wish you good luck and take care of you. If you want you can search about electromagnetic sensitivity by yourself.