Why am I not getting message at my Lenovo Vibe K5 Note?

When I try to start whats app, They sent me 6 digit pin no at my mobile number.  didn't receive yet. My vodafone number is old. I have been using since 2013. The number is ok. But when ever I put the nano sim the problem arise. Even I tried to send sms from other number. But still not getting message. What happen with me new phone?

You cut the SIM by yourself to make it a nano SIM? If it's not a signal issue that can easily be refreshed by a simple phone restart then I'm afraid you may have accidentally damaged the SIM. Take it to one of your carriers outlets to get a new SIM card.

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