Dear Mr. Abonde
Thank you for your email. We are happy to reply to your query.
The new iPhone mobiles (prepaid-Easy & postpaid) will be SIM-locked for 24 months. Swisscom is not allowed to sell unlocked iPhones. The SIM-lock is a component of the agreement of Swisscom & Apple. So it will be not possible to use it with SIM Cards from other providers.
So if you travel often, don't buy an iPhone DONT BUY.
(or at least not in Switzerland).