Apr 7, 2017 - 5:55 AM
1. I've used this SIM card a while ago and don't recall issues with WhatsApp. Indeed you need a verified phone number, but you already have that I suppose or can arrange for that before you replace the SIM. Once WhatsApp works I am quite sure it does not need a phone signal. I did not have problems with that, but you can test it by removing/disabling your current SIM and see if it still works.
2. It depends on your requirements I guess. It worked fine for me. Note that the card does include a phone number, just no phone plan. See "How to install the Simly SIM card" on myswissalps.com/ simcard. I think you can receive an SMS on that and even call emergency numbers, but I did not try this. Wifi at the station is not needed as you have the SIM, unless you think you will use all of your data and more.
Of course the superior option is the TravelersWifi mobile hotspot, explained on the same page. You'll have unlimited high speed internet everywhere you go, and your SIM stays in place so your phone keeps working as usual.
3. I have not tried these, sorry.