Also if you want better than 100/10 Mbps make sure it has 1GB ethernet ports - many cheaper/older models only have 100 Mbps ports - also 3 or 4 LAN ports to connect devices to on wire.
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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, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.