Informal, just discussing your skills, the kind of person you are (as you can understand specific features stand out for a sales job), experience and availability. Nothing much to worry about in my personal experience. However, if given an offer this just gets you through to the 2 day training program where you learn about 'Pin Point' and the carphone sales technique along side a FCA test so that you can sell insurance. Sounds worse than it actually is- i met some great people and had a laugh.