Like the 3.5mm headphone jack 2g is old school and needs to be turned off if we are to advance. It's so slow that you can't even check your e-mails on it let alone browse the web when you are in a area with only a few bars of reception. It's for this reason that I prefer Spark\Skinny (hate the company, like the network) because there minimum is 3G so at least if you have reception it's fast enough to use.
The way of the future is low requency LTE\4G. Remember the old analog TV? Those frequencies got sold off to to the telecoms to use for their networks. Spark\Skinny for example are building a canterbury wide 700mhz network so anywhere in canterbuty you will be able to get 4g recetion with is 150mb on a good day. This also enables them to offer 4g based broadband so if you are on a farm with crackly copper phone lines you just leave it all behind and get a plug into the wall 4g model potentially with an external areal.
The fact that it's low frequceny (700mhz vs 1800 to 2100mhz) means it travels a lot further and there are less gaps in reception. So if you buy a phone make sure it supports 700mhz\LTE band 28. Sadly most of the increasingly good china phones don't support this band because they don't use that band in china.
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