The short answer
Plug it into a proper mains charger and leave it for at least half an hour before doing anything else, because a deeply discharged battery shows no sign of life while it trickle charges. Then force restart with the correct button combination for your phone, which is different from simply holding power. Only after both of those does a fault become likely.
A phone that shows nothing at all is one of the most alarming faults and one of the most frequently recoverable. There are three plausible states: the battery is too flat to display anything, the system has hung, or something has genuinely failed. The first two are far more common.
Step 1: charge it properly and wait
Use a mains charger, not a computer or a car socket
A deeply discharged battery needs more current than a low-power port supplies, and it may never reach the threshold to boot.
Use a cable you know works
Test it on another device first. Cables fail internally with no visible damage and are behind a large share of these situations.
Leave it for at least 30 minutes
An hour is better. During the protective trickle stage the screen stays completely dark, which is exactly the behaviour that convinces people the phone is dead.
Check for any sign of life
A charging icon, a vibration, warmth near the charging port. Any of these means the phone is alive and charging.
Try a different charger and cable if nothing happens
Swap both, one at a time, so you know which was the problem.
Step 2: force restart
This is not the same as holding the power button, and the combination differs by manufacturer:
- iPhone 8 and later: press volume up, release, press volume down, release, then hold the side button until the logo appears. This takes up to 20 seconds of holding.
- Most Android phones: hold power and volume down together for 10 to 20 seconds.
- Some Samsung models: hold power and volume down for at least 7 seconds.
- Phones with a removable battery, which are rare now: remove it for 30 seconds.
Hold longer than feels reasonable. Many people release at five seconds, which is not enough on most phones. Keep the phone on the charger while doing this.
If the phone vibrates or shows a logo and then goes dark again, it is booting and failing rather than dead. That is a software problem, and recovery mode or a system repair from a computer is the next step, which usually preserves your data.
Step 3: check whether the screen is the problem
A phone can be running perfectly with a failed display. Check:
- Does it make notification sounds or vibrate when messaged?
- Does a computer recognise it when connected by cable?
- Does it appear on your account’s find-my-device service as online?
- In a completely dark room, is there any faint backlight glow?
If any of those are true, the phone is alive and the display or its connector has failed, which is a repair rather than a replacement, and your data is intact.
Step 4: consider what happened before
- Dropped recently: the display connector may have come loose, which is an inexpensive repair.
- Got wet: stop charging it immediately. Charging a wet phone causes far more damage than the water itself. Leave it to dry for at least 48 hours, and do not use rice, which does very little and leaves dust in the ports.
- Very hot or very cold: phones refuse to operate outside a safe temperature range. Bring it to room temperature and try again.
- Battery health was already low: an ageing battery can fail to supply the current needed to boot even when it reports charge.
- It was mid-update: a failed update leaves some phones in a state that only a computer-based recovery can fix, and those tools usually have an option that preserves data.
If the phone is swollen, with the screen lifting at an edge or the back bulging, do not attempt to charge it and do not press on it. A swollen battery is a safety hazard and needs professional handling.
Step 5: recovery from a computer
Both major platforms offer a repair path that reinstalls the system software without erasing data, using a computer and a cable. On iPhone this is the update option in recovery mode; on Android, the manufacturer’s desktop tool offers an emergency recovery or software repair.
Read carefully before proceeding, because each of these tools also offers a restore option that erases everything, and the two sit next to each other. Choose the one that preserves data first. If it fails, the erasing option may be the only route back to a working phone, and that is the point at which your backups matter.
When it is a hardware fault
If the phone has had a long charge on a known-good charger, a proper force restart with a long hold, and shows no sign of life at all, then a component has failed. The most common are the battery, the charging port and the power management circuitry. All three are repairable, and a repair shop can usually tell you which within a few minutes.
Before paying for a repair, consider what is on the phone. If your data is backed up, the decision is purely economic. If it is not, a repair is worth more than the phone, and it is worth saying so to the shop, because the approach to a data-recovery repair differs from a make-it-work repair.
How long should I charge a completely dead phone?
At least 30 minutes before expecting anything, and up to an hour if it has been flat for a long time. The protective trickle stage shows no screen activity at all.
Why does my phone vibrate but not turn on?
It is attempting to boot and failing. That is a software or firmware problem rather than a dead device, and a computer-based system repair usually fixes it with data intact.
Does putting a wet phone in rice work?
Not meaningfully. It absorbs very little moisture and introduces dust into the ports. Leaving the phone somewhere warm and dry with good airflow for 48 hours, without charging it, is better.
Can I recover data from a phone that will not turn on?
Often yes, if the storage chip is undamaged. A repair shop can replace a failed battery or charging port and the data is untouched. Water damage reduces the odds considerably.
Is a phone that will not charge always a battery problem?
No. The charging port, a damaged cable and the power management chip are all common causes, and the port in particular is an inexpensive repair. Clean the port of lint before assuming anything.
The sequence
Mains charger and a known-good cable, then wait half an hour without touching it. Force restart with the correct combination, held far longer than feels necessary. Check for sounds, vibration or computer recognition to rule out a display fault. Consider recent drops, water and updates. Then try a computer-based repair that preserves data, and only after all that treat it as a hardware failure.
