When Vodafone rolls out 4g on 800Mhz spectrum, will it cover as much area as their 2g?

I live in a rural area that only gets 2g phone reception. I understand that Vodafones current 3g works on 2100mhz, which is not as good at long distance range. So theoretically when they roll out 4g, it will cover as much as their 2g (on 900mhz)?
To the answer below, but if they are installing it at existing places, then surely the coverage will be as good as their existing 2g because it's on a lower frequency? The lower the frequency number, the further it reaches?