I think we now know that the 4G battlefront isn't going to be price in the UK. But it might well be data allowances.Vodafone has made the latest move in that area by introducing 4GBonus. As the name suggests, it means 4GB of extra data, which will be added to Vodafone Red 4G-ready plans until they expire, not just for a month or two. That's as long as you sign up to a plan before the end of October. Ah, there lies a catch, we'll get to that in a minute.But let's stick to the positives first. If you sign up to the cheapest 4G tariff for £34 over 24 months, that currently gives you 2GB of dates per month. But now, you get that boosted to 6GB, which is a really sweet deal. As an extra bonus, there's also unlimited data for the first three months too. Excellent.Now, that catch, which is obviously Vodafone's coverage. Vodafone's 4G coverage is currently limited to London, but will be launching in Birmingham, Coventry, Leicester, Nottingham and Sheffield on 28 September. Which leaves a lot of the UK without access to Vodafone's 4G service and with that in mind, makes this offer useless to those people. Even if you are covered in those cities, you'll need to be living and working there most of the time to get the full benefit.Vodafone aims for 98 per cent coverage of the UK by 2015, which is some time off. So a good offer, just a shame more of us can't join the party.