Can't get 4g to work on my iphone 5c?

I just got an iphone 5c today, it was a replacement because my last iphone was water damaged and unfixable. Vodafone have texted me saying I need to update my settings to use the internet and given me a link to download them from. However I can't connect to the internet wirelessly to open the link as the 4g doesn't seem to be working and safari says it can't connect to the internet. Any help? Why isn't 4g working?

No 4G is a network issue… Either your account is no provisioned for 4G yet, doesn't know you haave a 5c yet, or you have a 4G outage in your area…

regardless of the reason, I suggest using Wi-Fi… Like a local McDonalds or Starbucks… Connect… Then update…

if this was the USA, the wireless carrier should have done it them daaayymmmm self, manually in their system… (hint)