20% discount code not working

[mcquigar]

Hi all, 

I’m in the market for a new sim - eyeing up the £31 “Umlimited All Rounder” sim.
Have added it to my basket, but when u try to add my 20% teacher discount code, but it says it’s not accepted. Is this tariff not compatible? If no, which are please? 

Thanks 

[Matt_124]

Unfortunately the £31 All Rounder SIM is not compatible with any additional discounts as it is a Promotion/Time Limited Offer.

Discount codes can only be used on the core price plans shown below.

It may work out better in some cases to go for one of the offers as opposed to one of these discount-eligible plans.