Buying a Swiss prepaid SIM at Zurich Airport?

[inquisitor]

OK Mobile is an MVNO on the Orange network, which was tested best for smartphone usage by the "Connect" magazine last year. Despite swisscom has reached higher peak data rates in cities (7.9 vs. 3.5 MBit/s) and has a wee more 3G coverage all Swiss networks provide excellent coverage in global-scale comparison. Especially in the tourism regions, including alpine terrain, you will hardly find coverage gaps since inbound roaming is a significant revenue contributor for Swiss operators who therefore put great stress on covering these areas.

Regarding Orange I can't find the free data bonus on their website but if they throttle paying customers, they will throttle bonus users all the more.