Sorry, I totaly forgot SFR, because they are never mentioned at any vodafone network when it comes to data roaming. I just had a look at the mobilkom LI website.
If you are a mobilkom LI subscriber you may add a monthly "data roaming option"; for CHF 5 you have to pay only CHF 2,50 per MB of data when roaming. It looks like United Mobile got a good volume price because CHF 2,50 is about 1,50 Euro (compared to 1,17 from ICQSIM plus daily setup fee). Have a look here:
http://www.mobilkom.li/start.php?navid=113&l=de, it looks like the have excluded some networks for United Mobile (like sunrise in Switzerland)
I am waiting for my ICQSIM to arrive within the next days. See the other post with the outlook to upcoming UM services. They talk about expansion to 30 roaming countries within 2008...
BK
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Mobiles: iPhone 7+, iPhone 7, iPhone SE, Blackberry Priv, Honor 8, Lumia 950
Prepaid-SIM: 3 UK, Save Money Sim, Toggle Mobile UK, XX-Sim, Koko Mobile