VM now supply “wifi pods” (not “boosters”). These are free to customers on the 1GB or Ultimate Oomph packages, and so are worth trying. Are you on one of those packages?
If not you will be charged £5/month - and at that level of investment you would soon pay off the cost of buying a "better" solution that will be yours to own and use forever.
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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.