If an imei is blocked what features does a phone have?

[Liam]

Here's the crack, I've been arguing with my girlfriend (who I've been with for a long time) and I got her mobile out for her on contract, I got one for myself at the same time. What I want to know is IF we break up (and she's already said she'll refuse to give me the phone back to sell) could I ring my phone company as the phone is insured and tell them I've lost a phone on my account now I know they'd block the imei and send a replacement phone to my house BUT would she be able to still use features on it such as twitter, Facebook and Instagram? Or would the whole phone be blocked?

Any help would be nice

Thanks