Connection to "Secure" Time Machine

[luxmbrgus]

Hi. I have a weird question. I recently got the iPhone 3GS. After restoring it from my original iPhone, I was surprised that the new 3GS could connect to my wireless network that I had MAC address blocked even though I never entered my new iPhone's MAC address. So, I decided the reset the time capsule and create a new wireless network. I changed the new of the wireless network, hide the SSID, enabled MAC blocking, and gave it a WPA2 Personal password. Yet, both of my iPhones were still able to connect after I entered the new SSID into the iPhones but without me entering their MAC address into my allowed MAC list. Anyone seen this before? Is my network not secure at all? It is weird in that it did not allow a Lenovo onto the network until I had its MAC address entered. Thanks.