Got my plan upgraded from 100/5 to 300/20 today. After the activation and reboot, I saw improvement in the upload speed (from 5Mbps to 20Mbps), but no change in the download speed. It still ranges from 60 to 90Mbps.
My modem is MB7220 and wifi router Belkin N450DB
Solved! Go to Solution.
For your information:
It was the router. Although my router is labeled as "343Mbps wireless network", its ethernet port supports only 100Mbps maximum (It feels like a scam, doesn't it?). So the connection between the modem and the router is the bottleneck (thus, the modem ethernet light was flashing amber, not green).
Changed my router, everything is good now.