How to face time with no service?

Guest

I have an iPhone 4s that isn't activated and i was wonder can I and if so how can I facetime?

Tom

Connect to internet then try

Techwing

Activate the phone, and then you'll have FaceTime. If you can't activate it, return the phone to the person from whom you stole it.

MarkJ

You turn on facetime and make sure you have Wi-Fi connection.

Should I Face Time my cousin? OK, I have my second cousins phone number and she is 13 and I'm a 14 year old guy. We barely see each other, we both have iPhone's. Will it be weird if I Face Time her?
Is the StarCall app like face time with kpop idols? And how do you use it? Is StarCall supposed to be like face time on the iPhone? I've been looking at video's of other people's Star Call and it looks pre recorded. I don't know:/ How can you call kpop idols? I saw in the Super Junior StarCall video that it gave a number. Do I call it and then I video-chat with them? Or do I just wait for them to call me?
IPhone 4 gets Service then No Service? Ok so I have an iPhone 4 factory unlocked then when i put my prepaid T-Mobile sim card in, it doesn't work. Sometimes it works then sometimes it just does not work at all, what is wrong with my iPhone, thank you.
IPhone 4 face time activation issues? I have an iPhone 4 running on iOS 9, with no service. I was attempting to activate both facetime and imessage. Imessage and facetime both say waiting for activation under settings. However, imessage is working perfectly. When ever I try to make a facetime call it instantly says call failed. I even had my friend try to facetime me and it said unavalible for facetime. Are there any solutions too this?