sms fail , but can phone the same people

I do but most of my contacts dont use whatsapp , so that makes it hard

 

just noticed that the people that I cant sms are people with iphones how bad is that !

 

But that should not make any difference!

 

yip , thats right ,

 

Again, I would check you network settings, sometimes they need to be reset, and if that doesn't solve it, contact your wireless provider.

 

check network settings ? my provider or my phone ?

 

In Settings on the iPhone. If resetting doesn't work, call your provider.