In August, I'll be leaving for Europe and would like to use my iPhone 6. Last time I went, I used applenberry's unlock services online for my iPhone 5 so that I could use my phone on a foreign carrier (Drei mobile), however the site's unlocking part has been closed. Do you know where I could get an IMEI unlock for my iPhone before I go abroad?
This question has absolutely nothing with SE travel. There many online websites that can do that yet there are triple that amount of scammers.
Genuine websites rarely do individual devices and most of the time you have to load your account with £50 or so.
Like one of the comments suggested contacting your carrier is what you should first. Having said that this website is reliable, I personally have unlocked over 200 devices using their service.