How to send a text message (SMS)?

I need to know my dad use to have an iPhone and he used his phone no for iMessage. Now he has a samusang galaxy s3 and the iMessage is keep on coming on the screen how do I disable it to send a text message so my dad number goes red not blue Because he will not receive a iMessage please any help thanks

Well there's always the manual and online help.

I think you should look in the manual that came with the phone or go to your cellphone provider and let them help you out.

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