How can I help improve my friends home 3G internet connection?

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http://unix.stackexchange.com – My friend uses a 3G router for her home internet connection, using a T-Mobile UK PAYG SIM. It's horribly unreliable and we think the culprit is the 3G router. As a test, we placed an Android phone in the same location on the same network and used it as a WiFi hotspot. It worked perfectly. We've proven that using 3G as home broadband is both fast and reliable enough for her usage (twitter, youtube, facebook, blogging). So, I'm thinking of installing better software either on her router or one I have lying around the house. Here's a list of our hardware: Her router: Edimax 3G-6200n My router (HowTos)