I too came from an Eris and can relate to the call issues. I was forced to use the "call confirm" app just to know when the phone finally put the call through. I can tell tell you that the Thunderbolt has NO issues with the dialer. The phone is extremely responsive in all situations. Everything loads quickly and works without issue. I had gotten so used to the Eris, which, although it had its problems, I loved. The TB is a huge upgrade in all respects. Even the battery which people complain about, is as good if not better than the Eris. Not saying much, I know, but if you can deal with the Eris' battery ou'll be just fine with the TB!