I use on my 7100I but am waiting till my company opens up the BB to other providers. Bad Nextel Service in my area will make me switch. I loved the radio. With that said, my companies policy of charging for personal calls will make me get a pre paid cell phone to cover those personal calls. Personally I would rather just have one phone.
Unfortunately, I have to carry two devices: a Sprint phone for voice and a Cingular 7290 just for data. The only way I could foresee having a single device is if one of the following two things happen:
1. Cingular starts offering service in the Washington, DC Metro tunnels and stations.
2. Sprint releases my dream Blackberry: CDMA EVDO Rev.A (which, as I understand, will allow for simultaneous data and voice) with GSM/GPRS/EDGE backup for international roaming. Now, that'd be a killer device for Sprint and Verizon! Why won't RIM come out with something like this?
I carry a Nextel 7520 and a cell phone (Cingular). My company went a little cheap and only turned on the direct connect feature of our 7520's. Since everyone in the company has the same model, the company figures we can just DC, PIN, or email everyone.