Best answer by Mohammed
Welcome to the iD Community.
Click Here to find a great topic on our community for preparing your phone if you're going abroad.
We also have a tool on our website found here that lets you find out the charges for using your phone when abroad.
I've outlined the charges for Switzerland for you.
Calls to UK: £2.40 per minute
Calls to Switzerland: £2.40 per minute
Calls Received: £2.40 per minute
Texts to Switzerland: £0.60 per SMS
Texts to UK: £0.60 per SMS
MMS Messages: £0.60 per MMS
Internet & Data: £1.50 per MB