Best option for a e-Sim card?

I live between France and Switzerland and I have a French account at ORANGE (which is very cheap and gives me mobile data everywhere in Europe etc…) I need a Swiss phone number just to use TWINT and to send some SMS and do some calls from time to time, in Switzerland.

What’s the best option? I heat about Apps like « MobiMatter » to have a e-sim directly on my phone. Any other advices? I really don’t need a lot, just to be able to receive and do some calls every months + TWINT

:)