Strategy
Your smart phone setup
Roaming-free abroad — how it works in practice
📱 Swiss SIM (home card)→Call forwarding→VoIP app (incoming)
Swiss SIM→Peoplefone PrePay→outgoing, shows your Swiss landline number
🇪🇺 EU SIM (Yesss!)→EU calls (Roam Like at Home)
⚡ eSIMProfi24→Data anywhere, whenever you need it
| Function | Solution | Cost |
|---|---|---|
| Incoming calls (Swiss number) | Swiss SIM → call forwarding → VoIP provider app (domestic forwarding, e.g. guest-voip.ch) | Cheap — Swiss domestic rate |
| Outgoing calls | VoIP prepay (e.g. Peoplefone) — displays a Swiss landline number | from 3 centimes/min to Swiss landlines |
| EU calls (holiday) | EU prepaid SIM (e.g. Yesss! Austria) — Roam Like at Home within the EU | Included in the EU tariff |
| Data abroad | eSIMProfi24 data eSIM — local rates, added flexibly | Only when needed — from about CHF 1.50/GB |
| Home network Switzerland | Low-cost Swiss plan (from CHF 9.90/month) as the base line and forwarding basis | from CHF 9.90/month |
What you need
- Dual-SIM smartphone (physical or 2× eSIM)
- Cheapest Swiss plan (e.g. CHmobile, GoMo+, Lidl Connect)
- EU prepaid SIM (e.g. Yesss! Austria — orderable online as an eSIM)
- guest-voip.ch or a similar VoIP provider (free of charge)
- Peoplefone prepay for outgoing calls (from CHF 5/month)
- eSIMProfi24 data eSIM (only if you need data while travelling)
Frequently asked questions
What does this setup cost per month?
Base cost: CHF 9.90–14.95/month (Swiss plan) plus CHF 5/month (VoIP number). eSIMProfi24 only when you travel.
Does this work with any smartphone?
With any dual-SIM device. The iPhone 13 and newer, and recent Android flagships, support dual eSIM.
What if my Swiss SIM is an eSIM as well?
No problem — modern smartphones support two simultaneous eSIM profiles (dual eSIM).
Can I keep my existing Swiss number?
Yes — your existing number stays on your Swiss SIM. guest-voip.ch gives you an additional landline number as the forwarding target.
As of: 2026-06-01