SMS sending from old number even after transferring the number - iphone 6 ( Australia )

I came across this problem after I changed my mobile provider. Transfer of number was successful and I was able to call from my old number. But the problem was after I send  a SMS its actually showed my new peremptory number to the recipient. So I ended up with so many 'Who is this' messages.

So lets fix this for iPhone 6 ( iOS 10.3.2 ) .  

1. Turn of iMesseges.

• Settings > Messages > Switch off iMessges

2. Turn of facetime

• Settings > Facetime > Switch off Facetime

3. Reset network settings of your iphone. After this your iphone will be restarted.

4. After you restarted the iphone switch on facetime and imessage,