General meaning:
* Handlich: This is the most literal translation, meaning "handy" in the sense of being easy to handle or use.
* Praktisch: This translates to "practical" and conveys the idea of something being useful or convenient.
For a mobile phone:
* Handy: This is the most common word for a mobile phone in German.
* Mobiltelefon: This is a more formal term for a mobile phone.
For a tool:
* Handlich: This can be used for tools that are easy to use and hold.
* Praktisch: This can also be used for tools that are useful and convenient.
For something that's helpful or useful:
* Nützlich: This means "useful" or "helpful".
* Hilfreich: This means "helpful" or "beneficial".
The best translation will depend on the specific context of your sentence.