[Bossman]

Just received a newsfalsh from UM. They current holders of the +423 sim to replace it with the new one and they will transfer the credit over too. This option is available up until 07/31 I will jump on it right now. It will almost make no sense not to. I will not be surprised if they eventually do away with the +423 number

Here is a cut/paste....
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Replace your existing SIM card with the NEW United Mobile+ SIM

The advantage of the United Mobile+ SIM card:

From 0,29 EUR/minute calling worldwide
and save up to 25%
Incoming calls in over 80 countries for free
Attractive prefix +44 (UK)
Globale Coverage
Data Service in Q4 2007 avaliable
Replace today your SIM card on your personal MyAcccount.

Full transfer of your balance to the new SIM card
Automatic recharge parameters can be transferred with one click
Replacement and shipping FREE of Charge
until 31st of July 2007! REPLACE NOW

Yours truly,
United Mobile Team