Another backup solution would be to use an Apple iPod touch to make and receive calls using a VOIP client such as the 3CXphone app.

Using a ZTE MF60 MiFi together with an external antenna (if required) such as 10dBi 1920-2170Mhz Directional Antenna with an iPod touch, cheap international calls, clear voice quality calls and the ability to make calls in poor 3G signal strength areas.

The iPod also makes for an excellent HiFi using a Fatman Wi-Tube Amp and dock.