Mobile phone use while driving is common, but it is widely considered dangerous due to its potential for causing distracted driving and accidents. Due to the number of accidents that are related to cell phone use while driving, some jurisdictions have made the use of a cell phone while driving illegal. Many jurisdictions have enacted laws to ban handheld mobile phone use. Nevertheless, many jurisdictions allow use of a hands-free device, in which the driver talks using a microphone and a speakerphone. Driving while using a hands-free cellular device is not safer than using a hand held cell phone, as concluded by case-crossover studies, epidemiological, simulation, and meta-analysis. In some cases restrictions are directed only at minors, those who are newly qualified license holders (of any age), or to drivers in school zones. When mobile phones were first introduced, they were typically only able to make voice calls. In the 2000s, as cell phone technology developed, and smartphone usage increased, cell phones can also be used to read or type text messages, surf the Internet and view videos. Activities such as texting while driving can also increase the risk of an accident.