Tethering problem with 4.2.1

I downloaded the new 4.2.1 yesterday and at first didn't notice anything out of the oridinary. This morning when I went to tether my phone to my MacBook Pro, the tethering part would not work. I have gone into the settings on the phone and made sure that tethering was in fact turned on and it is. I do not see the typical 'blue' banner at the top when I am plugged in and my MacBook does not recognize my phone as a network connection anymore.

Does anyone else have this same issue?

How about the screen lock only allowing you to lock in portrait?

Thanks in advacne for the help.

 

Yes Mark, I am paying AT&T to tether. I have cycled the tether switch off and on a few times and restarted the phone with the same results.

 

I was able to get my phone to tether using Bluetooth but not the USB cable. Under network preferences I get an error now saying: "Either the cable for iPhone is not plugged in or the device is not responding."

I never got this error before when I connected via USB to tether.

 

I did some other research and noticed some others overseas were messing with some settings inside the phone. I played around with these settings and my iPhone 4 is now tethering via USB cable to my MacBook Pro. I was able to tether using Bluetooth but not the cable.

The other sources mentioned going into the Cellular Data settings and changing some stuff. Being in the US, there are no settings that we can change around so I played with the phone.

Here's what I did and it worked on my phone. I went to Settings-General-Network. I toggled the Cellular Data from On to Off and then back On. iTunes did a sync and then everything worked fine. In Network Preferences on the MacBook Pro, my iPhone showed up green like it used too and the blue tether banner was on. I don't know if this was some sort of 'official' fix but it made my tether work using the USB cable.