Will it cost me extra to text someone in the US?

I've been talking to someone from the US an we both have iPhones, but I don't know if it's gonna cost extra for me to text her and I'm with t-mobile. Will it be the same as iMessaging (free or whatever) or is my phone bill gonna give me a heart attack?

Well i dunno do i

IMessage does not cost you anything. It goes over the internet, and works whenever both of you have data access (like if you're at home on Wi-Fi for example).

Whether you pay for international texts is up to your carrier.

If you are both using iMessage on Wi-Fi connections then there would be no charges. If not, say on data then there would be charges but not more than it would have been because of the distance. For the record iMessages are not texts since internet access is required.

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