Are you looking for a good mobile phone deal in your new country? Trough ESN you can get a free Yallo voucher for a SIM card with a 5 CHF calling credit (prepaid offer, no subscription necessary). The rates are among the cheapest you can find in Switzerland and the network coverage is identical to the one of Sunrise (one of Switzerland's big 3 in phones):
Moreover, if your friends also have Yallo, you can call them for only 0.05 CHF/min!
Just ask your nearest ESN section regarding your free voucher for a CHF 5.00 yallo SIM-card, redeemable at over 80 Sunrise centers Swiss-wide.
By the way: You don't need a new mobile phone for yallo. Simply use the yallo SIM card with your previous mobile phone (except for SIM-locked phones) and benefit from the unique price plan.