# blue box

> electronic device used to illegally place free long-distance telephone calls

**Wikidata**: [Q586874](https://www.wikidata.org/wiki/Q586874)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Blue_box)  
**Source**: https://4ort.xyz/entity/blue-box-q586874


## References

1. Freebase Data Dumps. 2013