I was looking through new plans for an exisiting mobile phone. I was confused by the plans on offer as the pricing seems illogical or am I missing something? I have included a screenshot of some of the plans. Here are two plans, offering 30GB data for £18.98 a month, or what looks like an identical calls/text plan with more data , i.e. 50GB for £18.00 ??!! The only difference being the word "Ultd" in the plan name compared to "Unlimited" in the more expensive plan with less data? Also I cannot ascertain if these plans have a minimum monthly duration, e.g. 12 months minimum.