how can i move my messages from my old android galaxy s4 to my iphone se that has already been set up

ziggy1949 Said:

"how can i move my messages from my old android galaxy s4 to my iphone se that has already been set up"

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Go Here: Move from Android to iPhone, iPad, or iPod touch - Apple Support

Screenshot:

ziggy1949 Said:

"i can't see the "move to ios" app on my phone even though it says it is installed."

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Restore you iPhone to Factory Settings:

Your best bet is to restore your device to factory settings. Then, see if this is seen.

Go Here: Restore your iPhone, iPad, or iPod to Factory Settings - Apple Support

IMPORTANT:

Be certain you create a backup of your device, prior to all of this. That way you have something to restore your device from should anything go wrong with the reset.