It does not matter if you have a 3g device or a 4g device, you will not have unlimited for long. Yes sir, that has never had bearing on your data usage. As we move to capped data, those that try their best to skate the system will find themselves handicapped by throttled data. So while you upgrade, and bite rope to hang on to that unlimited plan, you will notice your data speeds slowed down so much, you will wish you had a tiered plan.