A flat tyre on a quiet Sardinian road is stressful enough; having no phone signal makes it harder. The safest plan is to get the car out of the traffic lane if possible, make yourself visible, and use the repair equipment supplied for your vehicle only if the location and damage make it safe. A tyre inflator or sealant kit can sometimes get you to a tyre shop, but it is not a universal fix. Never improvise a jack support with loose stones or work beneath a car held only by a jack.

1. Get to a safe place first

If you notice a puncture while driving, slow down gradually and avoid sudden braking or sharp steering. Stop as far from moving traffic as you safely can, ideally in a proper lay-by, car park or wide, stable area away from the road. Switch on the hazard lights.

Before getting out, check the traffic and your surroundings. If the car is stopped on a narrow road, blind bend or steep verge, do not start changing the wheel in an exposed position. Keep passengers away from traffic and follow the vehicle manual and local road-safety requirements for warning equipment and high-visibility clothing.

2. Check what equipment your rental or own car has

Not every car carries a spare wheel. Check the boot for one of these options:

  • Spare wheel or space-saver: use it only if you can change the wheel on firm, level ground and can follow the vehicle manual safely.
  • Tyre inflator and sealant kit: this may temporarily seal a small puncture in the tread, depending on the tyre, the damage and the kit instructions. It generally is not suitable for a large cut, sidewall damage or a tyre that has come off the rim.
  • Portable compressor: air alone may help only if the tyre has lost pressure without serious damage. If air escapes quickly or the tyre is visibly damaged, do not rely on inflation to make it safe.
  • Run-flat tyres or mobility service: check the car manual and rental agreement for the specific limits and assistance process.

With a rental car, follow the rental company's instructions. Using sealant or changing a wheel without checking the policy may complicate assistance or repair arrangements.

3. Do not use loose stones as a substitute for proper support

Putting stones under a jack or using rocks to improvise a wheel-changing setup is unsafe: stones can shift, crack or roll, and the vehicle can fall. Never put any part of your body beneath a vehicle supported only by a jack. If the ground is soft, sloped, loose or too close to traffic, do not attempt a wheel change there.

If you have a proper spare, a stable level surface and the manufacturer's instructions, use the designated lifting point and the correct equipment. Otherwise, prioritise getting professional roadside assistance rather than improvising.

4. What if there is no mobile signal?

First, stay in a safe place. If the car is safely parked and the area is not isolated or dangerous, you may need to move on foot only as far as necessary to find a location with coverage or ask for help. Do not walk along a fast road or across private land, and do not leave passengers—especially children—in an unsafe situation.

If a call fails, try again from a safer spot where reception may be available. The European emergency number is 112, but a call still needs a compatible network to connect; do not assume it will work where there is truly no coverage. Use 112 for an emergency involving immediate danger or injury, not as a substitute for routine tyre assistance.

Before driving into remote areas, save your rental company's breakdown number, roadside-assistance details and your accommodation contact offline. Tell someone your route if you are travelling through isolated areas, and keep your phone charged.

5. If you cannot safely fix the tyre

  • Stay away from traffic and make the stopped vehicle visible using the warning equipment required for the situation.
  • Do not continue driving on a flat tyre; it can damage the wheel and make the vehicle harder to control.
  • Do not use a sealant kit if its instructions exclude the damage you have, or if the tyre is torn, off the rim or visibly unsafe.
  • When you regain signal, contact roadside assistance or the rental company's emergency number and give your location as precisely as possible.
  • If there is immediate danger, injury or a serious road hazard, seek emergency help when a network is available.

Before driving around Sardinia: a simple tyre checklist

Before leaving town, especially for rural beaches, mountain roads or quieter inland routes, check that you know where the car's tyre kit is and how it works. Confirm whether the car has a spare, inflator, sealant, jack and wheel wrench; do not assume every rental vehicle has the same equipment. Check tyre pressure and visible damage before a longer trip.

Keep offline maps downloaded, charge your phone, carry a power bank and save essential numbers in your contacts. These small preparations are useful when reception becomes patchy away from towns.

Frequently asked questions

Can I use a tyre repair kit without phone signal?

Yes, if the kit is suitable for the damage and you can use it safely according to its instructions. You do not need a phone signal to operate most basic kits, but the kit is only a temporary solution and may not work for every puncture.

Can I put stones under the jack?

No. Loose stones are unstable and can shift or break. Use only the vehicle's specified lifting equipment on firm, level ground; never go under a vehicle supported only by a jack.

Can I drive slowly on a flat tyre to find help?

Do not drive on a fully flat or visibly damaged tyre. Stop safely and arrange assistance; driving on it can damage the wheel and compromise control.

Will 112 work if my phone shows no signal?

Emergency calls depend on an available compatible mobile network. If there is truly no network coverage, the call may not connect. Try again from a safer location with reception, and use 112 for genuine emergencies.

What should I keep in the car for remote Sardinia trips?

Know the location and instructions for the spare or repair kit, keep a charged phone and power bank, download offline maps, and save roadside-assistance and rental-company contacts before setting off.

The takeaway

With a flat tyre and no phone signal in Sardinia, safety comes before improvisation. Stop away from traffic, use the vehicle's proper repair kit only when appropriate, and never rely on loose stones to support a car. If the ground or road position makes a wheel change unsafe, wait until you can contact roadside assistance. Preparing offline maps, emergency contacts and tyre equipment before a rural drive can make a difficult situation much easier to manage.

Sources and further guidance

ACI — Roadside emergencies and warning precautions; Dacia owner manual — puncture and spare wheel / inflation kit; Italian Ministry of Health — European emergency number 112.