Can I activate my new sprint iphone over the phone or online?

I'm pretty sure that the sprint store is closed today and I'm just replacing my new iphone 4s with a new one that isn't broken at the apple store. Will I be able to activate it today at all like over the phone or online or what?

They usually have 24hr 800 numbers for that kinda thing

1-888-211-4727, and then listen to the choices… One of them will be "to buy or activate a phone", then follow the steps. You will need the MEID# from the box. If you don't have the box you'll have to look under the settings option in the phone. Enter that when prompted and it will put the phone on the account. You might have to reset the phone to get it to activate afterwards. Just reset the network settings.