Vodafone blocks Skype and everything VOIP, don’t know about tethering but being Vodafone (aka shitty with customers) it wouldn’t be a surprise to me if they block it. The other providers are not great.
Integrating with Skype for Business - onenet.vodafone.com Integrating with Skype ® for Business. The One Net app can integrate with Skype for Business (previously known as Microsoft ® Lync ®).Through Skype for Business, the One Net app can also integrate with other Microsoft applications, such as Office 365 ™ and Internet Explorer ®.. To integrate the One Net app with Skype for Business, you need to download and install the dedicated version of How To Remove And Block Contacts In Skype | Technobezz Jun 13, 2018 Vodafone Blocks All VoIP Applications Over 3G
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Blocking all incoming calls. If you don't want to be disturbed, you can block all calls coming to your number. All your incoming calls are then treated as if you're already on a call. Skype: what is the difference between blocking someone and Jul 13, 2016 How to Tell if Someone Blocked you on Skype - 2020 (100% Apr 26, 2020 How to block someone on Skype | Mobile App (Android Oct 10, 2015