234 20 6128 52727
Thanks JimmyBand28 on the ISPreview forums for notifying me about this deployment:
https://www.ispreview.co.uk/talk/threads/three-mvno-related-posts.40930/post-354150
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Not managed to map yet, but I have confirmed seeing Band 1 and Band 3 from the mast through aggregation with Band 28.