A:Answer The main issue you will have with an unlocked device is the SIM card, going from an old flip phone you are almost assured to have to get a new one. The card I was using with my Galaxy Note 3 was too old, form factor wouldn't fit (SIM cards are like SD now. They have a standard, mini, and micro size) so I had to get a new SIM card and activate that. Otherwise, shouldn't be any activation fees as the device is ready to use out of the box. I was without a SIM in my device for the first couple days while getting it set up, only had a prompt at the notification bar saying "no SIM card." Carrier won't be as helpful with device centric issues because it isn't "their phone" yet the freedoms of unlocked is completely worth it.