A 2.4 Ghz phone will step on your lan if it's a spread spectrum phone...and most of the better ones are. 5.8 Ghz phones are now available, solves the problem easy enough.
Security requires a bit of effort. Too many people have it so you can just cruise by their house and get yourself an IP and be up and running on their network, surfing their shared drives, etc.
This is evolving technology, better security is coming. But for now, at least enable what's there. Use WEP, change your passwords, and make sure your shared drives aren't wide open, etc.
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