1. Look at the From address that’s shown and then the real From address which is usually shown between these: <>
2. Hover over any links to see if you recognise them as genuine websites. Even a hyphen where a dot would usually be can be an indication
Each smartphone works differently so be sure to check beforehand, but you can usually see the full link by holding down the link. A pop up will appear showing you the full link and asking what you'd like to do with it.
3. Vague or incorrect To details: just ‘Hi’ instead of your name