Mobile data and calls coverage is not what they show you on your website. I signed up a contract and looked up my work area KT100 showed 4G. Apparently, I have only one bar and my phone and apps don't load even when my phone is out of the building. I tried a few handsets. Called customer service. They said that I should call them up before I sign the contract to check if I am going to have a good reception at my workplace. Also, their system shows no issue at the address and the reception is good. I asked for technical support but the staff member said there is not such a thing. Very disappointed by the service, customer service and the way they treated me.