IMessage and FaceTime on iPhone sending not one but up to 15 activation SMS?

Why does my iPhone send so many SMS to activate iMessage it should on send one or 2 and then should stay activated as I have never turn iMessage on and off again. I got a new plan and now I get billed for international SMS it is no longer included.
$0.45 each SMS adds up quick as my plan is already $120 a month just for the included stuff.

Free sms

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