On 2007-01-19 16:53:50 +0000, "Mathew Newton" <usenet@newtonnet.co.uk> said:

>
> Mathew Newton wrote:
>
> Forgive the self-response but there's an update...
>
>> Hi everyone,
>>
>> I'm on Orange and recently upgraded my C600 to an M600 and in the
>> process was given a new SIM. Whilst trialling the phone for the 7 days
>> I used my old SIM to enable the process of returning the phone (and new
>> SIM) that much simpler should I decide to keep it.

<snip>

You should always register your upgrade and use the new SIM, as it says
on the invoice you get with the phone. (apparently they self-register
if still unregistered after a set period of time..)

Chris