[Nexus One Q&A, Help & Troubleshooting] blisk:
Well don't be so quick to dismiss the frustrated users. Some of the things on that list is petty although somewhat accurate i guess, speaker could be louder. I've also had an issue with cradling the phone against my shoulder as that seems to affect the quality of my voice and people complain i sound like i'm "in a tunnel" or far away. I'm guessing something with the noise canceling mic.

I've had the data connection issues which seems to just be a cell radio issue, probably hardware based with my replacement phone at least. I had my old phone replaced because it just did not want to connect via data or whatever for 5-20 seconds all the way up to 2 or 3 minutes. The up arrow on the 3g without any data coming back down issue. Whenever I did a speed test.. upload sometimes would be horrible and it would be really choppy (doing the speedtest.net one) compared to the download. By choppy i mean the meter would jump to different values (it wasn't smooth and consistent like the download) and sometimes it would just stop as would the data indicator lights. It was always around 100-500 kbps averaging around 300. Same behavior for both the original and the RMA.

With the replacement one that i've had for a couple of weeks that issue turned into a much larger one. It started when I wasn't able to make outbound calls so i turned off my phone and turned it back on again to get the x with four blank bars at the top. Re-registered on the network... seemed to work ok for awhile. Then the same thing but started getting a "sim card isn't valid for this network" error when trying to re-register my phone after again starting to randomly show me an x with 4 blank bars at the top. Hard resetting and soft resetting didn't fix it. Sometimes it'd give me an error even searching for them. When i first got the problem it was brief.. but i figured i should get my sim card replaced. So i did. 3-4 days later I wasn't able to get it to work for almost 3 hours.. on my way to the tmobile store it just went from x with 4 bars to 4 full bars and then finally the 3g indicator to the left of that came on. Turned around cause I really didn't have the time to figure out what it was about at that moment. Data worked, could make a phone call. Next day it just got worse to the point now where it wont' search for a network sometimes.. gives me an error after sometime.. and definitely won't register on the network. I also had airplane mode turned on automatically after a soft reset (despite it showing an x and 4 bars and not an airplane)wasn't able to turn it off via the android menu settings. Had to go into the service menu and press turn radio on button.

WIFI still works however.. but that's a separate chip from the cell radio chip and its has just wifi/bluetooth on it so that makes sense.

I've had tmobile double and tripple check everything, network cancellation, sim replacement, check the towers nearby, make sure my plan is setup correctly for my phone. I'm going with poor build quality on some of these and bad quality checking... I guess time will tell. Getting my swap on monday... car dock arrived today and is just sitting on my desk.