How can I fix a Whatsapp validation issue?

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Whatsapp validation issue

Recently i've got an Iphone 6, due the SIM card changes(from micro to nano) i had to transfer my number to my new SIM, the thing is that when i tried to validate whatsapp i can't. SMS and call are working but into the input code screen i have no keyboard, and just a message "Too many attempts", I hope someone can help me, thanks.

PS: Sorry for the bad english.
 

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