[/QUOTE]I called into the 3 store in Manchester today and an apparently very knowledgeable lady told me that you could tether to the 3 2 1 SIM The only time you could not tether is if you are on a package such as "all you can eat data" and you may be allowed to for a while, but after a while you would be cut off.
Phil I thought you were using the 3 SIM 321 so have you experienced the problems above. Have 3 cottoned on to the fact that you're using it in your car?
I remain to be convinced that 3 shops know what they are doing. On this link if you click on 'Price Plan Details it is specific about tethering:
Pay as You Go 321 - Price Plans â Three
'Pay As You Go plans do not allow tethering. If you would like to tether, you will need to choose a Pay Monthly plan and / or an Add-On that does allow tethering.'
Then again they did sell me a micro sim when I wanted a mini sim.