Is there any SIM card that can be used in both Switzerland and London besides those mentioned in the SIM card thread? I need it for two weeks to make phone calls and need 1GB data.
I'm not sure which of the SIM card related threads you've been reading, but our SIM card page at myswissalps.com/ simcard lists several options. The third option is the "Europe & More SIM card" which seems to fit your requirements: www.onesimcard.com/int ernational-sim-card/onesimcard-europe-and-more/. It covers all of Europe including the UK and Switzerland, and offers calls and data.
I used LYCA for london,amsterdam.switzerland,paris - very good service
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