Its easy for them to reactivate the Hub3 - the only reason it is not possible is if you have moved to the 1GB package - when you must have a Hub4/5 - is that the case?
If not - Call the equipment activation number on - 0800 953 9500 (option 3) – you will need the Hub serial numbers/MAC addresses off the barcode stickers and also your account number and tell them you want the Hub3 activating.
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.