I know it's frustrating, but I can also see why they do it - having only one type of modem/router simplifies support and makes setup easy for the user. The Vodafone router also has specific features that work with the associated app (which I realise not everyone needs).
There have been a lot of queries about using other hardware, so it's possible that something may come along. Make sure before you sign up if it's important to you, though.
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