If you are tired of unsecured wireless network notification on Android phone, you can block / unblock notifications. Bock network notification on HTC One by doing as follows:
1. Open "Settings" App
2. Make sure WiFi is enabled and tap it
3. Find the network to block, on the list of wireless network
4. Tap and hold on the network name
5. Choose "Block Network notification"
** Note that to unblock notification, you need to do the mentioned steps, and the only difference is the 5th step which you need to choose "Unblock network notification" instead.