BT Synergy 5500 Cordless phone SIM card backup

When I bought the above phone earlier this year, I eventually got around to finding an old mobile phone SIM card and inserted it into the base unit of my Synergy 5500 and copied the phonebook contacts to it.
All has been fine but on several occasions I have altered entries in the phone's phonebook and copied them over again to the SIM card. Now I realise that there are only so many times I can do this as it says it's full now.
My question is how can I delete the SIM's contents so that I can start over again?
Solved!
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AllanQuatermain wrote:
Id just pop the sim card into your mobile and use the functionality of your mobile to delete the content on the sim card.
Having said that, you can go online to virtually any mobile provider and have payg sim cards sent free by post. I keep a couple myself for exactly the same reason.
Many thanks for that sensible answer. I had stupidly assumed that each copy of the phonebook to the SIM,  would have overridden the previous one held there - goodness knows why, though.

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