In Switzerland, you can use Yallo (yallo.ch - they use the Sunrise network) which has a flat package for 39 CHF/month allowing unlimited calls across both CH+EU

In Switzerland, you can use Yallo (yallo.ch - they use the Sunrise network) which has a flat package for 39 CHF/month allowing unlimited calls across both CH+EU. If you happen to be roaming abroad, they have data plans for 10 days / 100MB for 15 CHF, which is not great, but way cheaper than the example you gave above.