My Lebara SIM in Australia works, and Lebara uses the Vodafone network infrastructure in Australia
National Vodafone networks (or those of any multi-country provider for that matter) are not all the same.
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Reliability, here, I meant overall quality as a service. This isn’t given and it is certainly not easy to answer which provider would fit best.
ps- I experience something with Vodafone, and Sailfish OS, only in Italy : after every call, it takes about 20-40 seconds to reconnect to the network and thus making a new call, or receiving one, is not possible right after the end of a call! This happens only in Italy. I have not observed this is any of Greece, Germany, France, Switzerland. This is certainly (is it?) then something on the configuration side of the provider.
It’s a bit of work, I guess, but I’d be willing to take the test too.
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same with xperia 10 II in Germany with “Drillisch” or “Aldi Talk” as Provider. The reconnecting is very slow (10 to 20 sec) and you are not able to use the phone.
By the way, I experienced also the issue, that simcard in slot 1 refuses to work suddenly (Drillisch, Germany, 10 II) restart did not solve the problem. something got stuck in Slot 1. after moving the simcard to slot 2 and restart it got network. switching back to slot 1 removed the stuck issue and the network got back online. had to do that 3 or 4 time in the last 6 months.
JFYI - Sim 2 did not help my situation:
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I’m Italian too. What operators are you using to test on 10 III? Is Ho another story to Vodafone? I have WINDTRE, and 3G is still offered, since I use my sim even on an old ASUs that only supports Hsdpa.
I’m looking forward to see if Jolla fixes this bug
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A test with Ho (the low-cost variant of Vodafone Italy, for non-Italians) or with any Vodafone-based MVNO could be useful.
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Since there are quite some Italian users in the forum, is there any confirmed mobile phone provider in Italy with which mobile internet on the Xperia 10 III just works? I will do the switch from Vodafone then.
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Iliad works fine. I have an Iliad sim in the X10III now and it works like a charm. That’s where I will switch my main Vodafone number if the issue does not resolve.
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Very strange to hear that. I have Elisa operator and use Xperia 10 III and no issues. Hopefully I’m not just a lucky one out there. I would report here if I would have problems but so far, I have just travelled from the south to the north of Finland and back. Sometimes I visited Germany but also there, no issues with my Finnish Elisa card at roaming. I’ve now the Xperia 10 III with SFOS since spring 2022 and like it quite much except the missing Android Bluetooth support.
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Have you roamed into Ålcom?
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Just don’t travel to Åland islands 
My X10III works fine also in the home network Elisa/Saunalahti, but ÅLCOM is too much for it to handle
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Yes, because in the Åland islands my operator Elisa doesn’t have network at all - (although travelling inside the country).
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No other provider? Iliad’s contract options are limited.
You experience the problem with an Xperia 10 III device and a SIM provided by WINDTRE?
Yes. I have one Vodafone SIM (my main one), one Windtre SIM (for my backup Android phone) and one Iliad SIM (which I use for data only). Only Iliad works.
Could the problem be related to the age of the SIM card? Old SIM cards vs new SIM cards?
same problem with old and new on talkmobile.
Thank you for your response. Wish it’d be a different one 
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