Ask any room of drivers what the mobile phone law is and half will say “hands-free is fine, hand-held isn’t.” The real rule is tighter than that, and for professional drivers the tighter reading is the one that matters - because cab cameras, employer policies and post-collision phone-record checks all apply the strict version, not the pub version. The Highway Code’s rules 149 and 150 carry the detail.
Rule 149: you MUST exercise proper control of your vehicle at all times. You MUST NOT use a hand-held mobile phone, or similar device capable of interactive communication such as a tablet, for any purpose when driving or when supervising a learner driver.
Then the clauses that close the loopholes. The ban covers all use of a hand-held interactive communication device - and it applies even when the interactive communication capability is turned off or unavailable. So “I was only checking the time” or “there was no signal” is not a defence: holding and using the device while driving is the offence, whatever the screen was doing.
Two habits are named specifically. You MUST NOT pick up the phone while driving to dial a number and then put it in the cradle for the conversation - the cradle does not launder the hand-held start. And you MUST NOT pick up and use a hand-held phone while stationary in traffic. The queue at the lights, the standstill on the motorway, the wait at the level crossing: all still driving, all still banned.
First: you may call 999 or 112 in a genuine emergency when it is unsafe or impractical to stop. Genuine emergency, and stopping genuinely not an option - reporting a hazard you could have pulled over to report does not qualify.
Second: using a hand-held phone to make a contactless payment at a contactless payment terminal - the drive-through or toll scenario. Here the vehicle MUST be stationary, and the goods or services MUST be received at the same time as, or after, the payment. A phone used to pay at a terminal while stationary is lawful; the same phone checked for messages in the same queue is not.
There is also a separate allowance for parking the vehicle using a hand-held remote control app or device - it must be legal, and you must not put other people in danger. That is a parking aid provision, not a general permission.
Rule 149 goes on: never use a hand-held microphone when driving, and note that using hands-free equipment is also likely to distract your attention from the road. It is far safer not to use any telephone or similar device while driving - find a safe place to stop first, or use voicemail and listen later.
For professional drivers this is the operative guidance. Hands-free is legal, but “likely to distract” is the Highway Code’s own characterisation, and after a collision the question “were you on a call?” is asked regardless of the microphone arrangement. Many fleets now set policy stricter than the law - no calls in motion, hands-free or not - and the Code’s wording backs them.
Rule 150 widens the lens to in-vehicle systems: sat-nav, congestion warning systems, screens and multi-media all carry distraction danger, and you MUST exercise proper control at all times. Do not be distracted by maps or screen-based information while driving; if necessary, find a safe place to stop. And driver assistance systems - motorway assist, lane departure warnings, remote parking - assist only: as the driver, you remain responsible for the vehicle and MUST have full control over these systems at all times. The fleet telematics screen and the dispatch tablet sit squarely in this rule’s territory: glance-worthy design does not make glancing safe.
The strict reading also protects the driver. “I didn’t know stationary in traffic counted” fails in front of every camera van and every phone-record subpoena - and the driver who builds the stop-first habit never has to make that argument.
A defensible fleet phone policy has five parts: a written ban on hand-held use in any company driving; a clear statement of the two exceptions so drivers know the actual law; a position on hands-free calls (the strictest defensible one is no calls in motion); mounting and pairing rules so navigation is set before departure; and a breach process that treats phone evidence like any other safety-critical violation. For vocational drivers the stakes are multiplied: the offence carries endorsement and fines, DVSA encounters it at the roadside, and the OCRS and repute consequences reach the operator’s licence.