This was the output of rfkill list before doing rfkill unblock wwan:
$ rfkill list
0: tpacpi_bluetooth_sw: Bluetooth
Soft blocked: no
Hard blocked: no
1: tpacpi_wwan_sw: Wireless WAN
Soft blocked: yes
Hard blocked: no
3: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
5: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
--
[regression] Bult-in modem ppp0 doesn't work after waking up from sleep mode.
https://bugs.launchpad.net/bugs/405053
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