Something wrong with texting?

I had an iphone and just got a samsung. I gave my phone to the store for money and they reset it and all but when people text me with iphones it sends to the other phone I guess cause they are sending in imessages and the only way I get them is if they hold it down and press the sms message thing. Is there anything I can do to change or fix that?

You have to turn imessage of on your iphone to stop that

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