What is cool about the technology is how it can be exploited in ways that mobile carriers do their hardest to prevent. Because a femtocell is the size of a router and can work anywhere with an internet connection there is nothing physically stopping you taking it with you to a foreign country, plugging it in, and enjoying zero rated roaming.. But this breaks many rules, including the fact you're illegally transmitting on spectrum in a country what you aren't legally allowed to use, which means carriers implement methods to prevent this.
The most common is IP whitelisting, where a mobile network restricts the devices to working with a fixed range of IP addresses, typically their own. Vodafone NZ appear to have adopted this method, restricting usage to customers using only a Vodafone broadband connection. Of course any network engineer out there will suddenly hear the word "VPN" jump into their head, and suddenly the opportunities are endless...
Please note that I neither condone or encourage breaking the law to exploit overpriced roaming charges!
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