Can you do group text messages with iPhone users?

One of the nice things I have with my current iPhone is the ability to do a group message with other iPhone users in the Messaging app. An iPhone user starts a conversation with me and a few others (iPhone or not), and my replies go to everyone on the conversation.

But I've sent messages to multiple non-iPhone users, and they receive it as if I only sent it to them, so they don't know there's a group involved.

I'm considering getting a Nokia Lumia - with Windows Phone 8, will I be able to continue using group messages as I do now, where I can see that I'm involved in a group conversation? Or will it look as though it's just individual conversations? Or does it depend on carrier and/or phone model?

It is not turned on by default in Window Phone thought. To turn on this feature you need to go to Settings > Applications > Messaging and there you can switch it on. As mentioned, this does rely on all the recipients having this feature turned on as well or else it would appear to them as a one on one conversation.