Three applies sneaky ways to squeeze more money out of customers.
I was about to transfer to Three for a phone contract, when I found out I paid for 4 months of mobile wifi that I didn't use and was outside of my year's contract. They convert it to a rolling contract after the end of your contract and continue to direct debit it, without informing you that this happens.
When contacting their customer service and offering a solution that results in no loss at all for Three, namely transferring the costs made to a new phone contract, instead of a mobile wifi. Your customer service is just trying to sell me more mobile wifi that I don't use, at a reduced price that would lock me in for another two years?! Why would I not just continue the contract I have, if that was what I wanted?
I am still expecting compensation for these uninformed extra debits, will not recommend Three to anyone in my surroundings, will not transfer to a phone contract with Three and expect you to add a communication point at the end of your customer's contract, explicitly informing them that you are transferring their year's contract into a rolling contract.
That is what a decent company would do.