What mobile phone accessory would add the most value to the product?

Hi guys, just doing a bit of research for a project.

If you could get one of the following accessories for free with your mobile phone purchase, which would you choose?

1. Cute Phone Charm

2. Leather Case

3. Travel Charger

4. Car Charger

5. Spare Battery

Any help would be greatly appreciated!!

I'd take the Spare battery or maybe the Leather case.

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