Drivers can receive fares for using a mobile device while supervising the driver. This is because the adult who supervises the student has an element of responsibility for the vehicle.
Any charges issued to the apprentice driver can also be handed over to the instructor, which means that passengers must be aware at all times.
However, the rule can apply to any family member or fined adult who is supervising the lesson and does not apply only to professional instructors.
Drivers caught using the devices could face a £ 200 fine and even face the threat of six points on the driver's license.
Apprentice drivers can face even higher fines of up to 1,000 pounds and six penalty points before they even pass the test.
SEE MORE INFORMATION: Drivers face a £ 200 fine for this error
“This includes voice calls and text messages. The penalty is the same for anyone who teaches someone to drive.
“They will receive six points in their portfolio, however, the consequences for a qualified instructor are much more significant.
"Six points on his license would almost certainly result in the immediate loss of the ADI badge and, ultimately, his livelihood."
It is illegal to use a cell phone while driving, as this can distract drivers while driving.
Previously, the law was only launched using a telephone for communication needs, but this has been enforced to include simply touching a device.
Phones can be used as a navigation tool in the lessons, but they must be in hands-free devices and configured before the driver leaves.
Neil Greig, spokesman for IAM RoadSmart said: “Supervising a student actually puts him in the driver's seat so nicely that you should treat him the same as if you were behind the wheel.
"Learning to drive is stressful enough without a passenger beside you who is more concerned with posting than parking."
Using a cell phone while driving can be seen as dangerous, as road users are likely to be distracted.
In serious cases, police officers may be forced to impose fines for driving with distraction, which can amount to 1,000 pounds.
Dangerous driving that puts others at risk has a maximum penalty of £ 2,500 or may even result in a driving ban.
Even using a phone to pay for items can be considered a traffic violation and can result in fines for drivers.
Car insurance policies can even be invalidated using a phone, as insurers may view it as negligence for violating the law.
Transport Secretary Grant Shapps said: "We recognize that keeping in touch with the world while traveling is an essential part of modern life, but we are also committed to making our roads safe."