Some Sprint users have reported WMWifiRouter does not connect properly to the internet, or other applications may become blocked from the internet because of WMWifiRouter use.

For all reported cases, the issue was resolved by going to Options -> Configuration -> Cellular Network, and setting this configuration option to PowerVision or Sprint PCS. The Phone as Modem option seems to break the internet connection on Sprint's latest firmwares.

You may have to restart your device after making this change for everything to return to normal.