My grandpa's iPhone 5S won't send SMS messages to non-iPhone phone?

He can call my mom's cell phone just fine, which is not an iPhone, but when it comes to texting, he can't send anything. I've made sure both numbers were correct and that all SMS settings were set right, but nothing changes. How is it possible that he can call her phone but can't send or receive messages?

Well if Gramps is using iMessage and does not send SMS (because he does not have a TEXTING PLAN, needed to send SMS from phone number to phone number) or even know that he can send SMS, that may be why he can't send "TEXT" to her phone.

Make sure he has a texting plan, try looking at your text setting you may have to change something with imessage.

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