If you have a version phone contract or prepaid all you have to do is put your SIM card in the phone and turn it on. If you have a deferent company it will have to be set to take the company's SIM CARD.
To make sure you get the most bids and credits from your listings, please add more information about your item. Additional details will help others bid with confidence. This also reduces the number of questions that your bidders have to ask. Lastly, can you please confirm that this phone has a clean IMEI (International Mobile Equipment Indicator) or ESN (Electronic Serial Number). A clean IMEI/ESN tells us that the phone hasn't been used for illegal purposes, hasn't been stolen, hasn't been reported on a mobile phone insurance claim, and hasn't been deactivated because of non payment of services. A phone without a clean ESN cannot be activated by another user.
Thanks for your cooperation and I hope you earn a ton of credits!