How do I get notified when somebody tweets on Twitter?

[Kiki]

Not really sure what you mean but when you subscribe to someones tweets like One Direction, it comes to your phone as a text like you said, another thing is make sure you have the app downloaded and not just open it in your internet, But I think they can only send as text messages like it may not pop up on your screen like you want it, not really sure but you can always just play around with your twitter settings. Hope I helped