Help Cell technician with gloves and a magnifier checking the board of an iPhone with no signal on the workbench

iPhone with no signal, no Wi-Fi or no SIM: repair

Bars gone, Wi-Fi won’t turn on or the SIM isn’t read? When an iPhone with no signal doesn’t get fixed in the settings, Help Cell checks the phone at Floripa Shopping and tells you what the fault is.

Check of antenna, SIM reader and board
Technicians with over 10 years at the bench
90-day warranty on the service

An iPhone with no signal almost always has one of two causes: something simple, like a SIM that isn’t seated right or a network setting, or a physical fault in the antenna, SIM reader or board. Help Cell tests the simple things first. If the fault is in the hardware, we check the phone at the bench at Floripa Shopping and send you the repair price on WhatsApp.

What causes an iPhone with no signal, no Wi-Fi or no SIM

The iPhone connects to the world in three ways: the carrier network, Wi-Fi and Bluetooth. Each one has its own antenna and circuits on the board, and the SIM is only the key that identifies your line. So one fault can knock out one connection and leave the others working.

Finding out which connection is down is half of the diagnosis. A phone that only loses carrier signal usually has a different problem from one that loses Wi-Fi and Bluetooth together.

No carrier signal

If the bars disappear and the SIM is recognized, the problem may be the plan, the network or the part of the iPhone that talks to the tower. Before opening the phone, test the SIM in another phone: if it works there, the fault is in the iPhone.

SIM not read or “No SIM”

When the iPhone can’t see the SIM, the common suspect is the SIM reader, the part the tray touches. Dust, corrosion or an impact that bent the contacts can stop it from reading the card. In many cases it is a localized repair, without replacing the phone.

No Wi-Fi and no Bluetooth at the same time

On many iPhones, Wi-Fi and Bluetooth share some of the circuits. If both fail together, especially after a drop or water, the fault is likely on the board, not in the router or the headphones.

Signs

When an iPhone needs a signal check

If you recognize one of these six signs after testing the basics, it is worth bringing the phone in for a check.

Shows “No Service”The iPhone has no signal bars, even with the SIM in place and in a spot with good coverage.

Shows “No SIM”The phone doesn’t recognize the SIM, or only recognizes it sometimes, after a drop or after the tray was moved.

Wi-Fi won’t turn onThe Wi-Fi switch is grey or turns itself off, and the network doesn’t show in the list.

Bluetooth won’t connectHeadphones, a watch or your car audio won’t pair, or the iPhone sees them and then loses the connection.

Signal drops and comes backThe iPhone loses the network for a few minutes, comes back and drops again, without you moving.

Only works near the routerWi-Fi is there, but it drops a few meters from the router, while other devices in the house stay connected.

What to test at home before taking the iPhone in

A few two-minute tests can solve many cases and show the technician where the problem is. Do them in this order and write down the results.

Simple tests to do now

Turn airplane mode on and off

Turn on airplane mode, wait ten seconds and turn it off. This forces the iPhone to search for the network again and clears temporary glitches.

Restart the phone

Turn it fully off and back on. It sounds obvious, but it clears software faults that drop the signal.

Remove the SIM and put it back

Use the eject pin, wipe the SIM with a dry cloth and push the tray in all the way. Never force the tray.

Test the SIM in another phone

If the SIM works in another phone, your plan is fine and the fault is in the iPhone. If it doesn’t work there either, contact your carrier.

Check for updates and reset the network settings

In Settings, General, Transfer or Reset, there is an option to reset network settings. It erases saved Wi-Fi passwords, so write down the main ones first.

What not to do

Don’t open the iPhone at home, don’t use a hair dryer if it got wet, and don’t press on the board. These moves turn a small fault into a bigger repair.

Step by step

How Help Cell checks an iPhone with no signal

Four steps, from your first contact to the iPhone in your hand.

1
You describe what happens
1 to 5 minutes. Tell us the model, whether the signal drops only on the SIM or also on Wi-Fi, and whether there was a drop or water.
2
We run the first test
The technician separates what is the SIM, the plan, the settings and the phone itself, before talking about parts.
3
We check the phone at the bench
If the fault is physical, the technician opens the iPhone and checks the antenna, the SIM reader and the board.
4
You approve and pick it up with warranty
Help Cell gives you the price for your case, does the approved repair and hands back the tested iPhone, with warranty.

Scope

What the check covers and what is left out

What is included in the bench work and what depends on other factors.

Included

Test of the SIM, the tray and the reader
Test of Wi-Fi, Bluetooth and mobile network
Labor by the Help Cell technician
90-day warranty on the repair done

Not included

Carrier plan or network problems
Router that is faulty or badly set up
Damage from liquid that was already inside the iPhone
Damage from a new drop after the repair

How much it costs to fix an iPhone with no signal or no Wi-Fi

The price depends on what is faulty, and that only shows up after the test. That is why Help Cell does not publish a single price: describe the problem on WhatsApp and the reply comes with the price for your case.

Factors that change the price of a signal and Wi-Fi repair
Factor	How it affects the price	Example
Origin of the fault	A settings fix is simpler than a board repair.	SIM not read because of dirt, versus a fault on the board.
iPhone model	The layout of the parts changes from one model to another.	Access to the antenna is different between generations.
Contact with liquid	Corrosion spreads the damage and may need chemical cleaning first.	iPhone that fell in water and lost Wi-Fi and signal.
Drop or impact	Loose contacts or cracked parts increase the work.	A corner drop that bent the SIM tray.
Several faults together	Several problems in the same check add up to more work.	No signal and also no sound on calls.

Describe my iPhone’s signal problem

What nobody tells you about an iPhone with no signal

Many people spend time with the carrier or the router when the fault is in the phone, and the reverse happens too. These points help you decide where to go next.

Common mistakes with an iPhone with no signal

Replacing the SIM without testing the old one in another phone

A new SIM costs time and won’t fix it if the iPhone’s SIM reader is faulty. Test the old SIM in another phone before asking the carrier for a replacement.

Resetting everything and losing data for no reason

Erasing the iPhone usually doesn’t fix a hardware fault. Start with the network reset, which only changes connection settings, and back up before any bigger reset.

Keeping on charging and using an iPhone that gets hot with a weak signal

If the iPhone gets hot for no reason and loses signal, stop using it and bring it in. Heat with a network fault can point to a problem on the board or the battery.

When the fault is in the iPhone and when it isn’t

The table sums up the most common clues. It guides the conversation, but only the bench test confirms it.

Clues to tell a fault in the iPhone from outside problems
Clue	Points to the iPhone	Points outside the iPhone
SIM in another phone	Works in the other phone and not in yours	Doesn’t work in any phone
Wi-Fi on other networks	Fails on every network	Fails only on the home network
Other devices on the same network	Only the iPhone drops	All devices drop
Device history	Started after a drop or water	Started after a change to the plan
Bluetooth with other headphones	No device connects	Only one specific headset fails

Why Help Cell

Why check your iPhone’s signal at Help Cell

Since 2007 in Florianópolis, at Floripa Shopping since 2012.

Board specialists

Signal and Wi-Fi faults are often on the board, and that is where the team works most.

Our own labor

Technicians from the shop check and repair. Nothing is outsourced.

90-day warranty

Covers the repair done against defects.

All brands

Besides iPhone, the team works on Android, iPad and MacBook.

Store in the mall

Open Mon–Sat, 10am–10pm, so you can stop by when it suits you.

Contact cleaning as a courtesy

If the iPhone also has dirty contacts, the cleaning is a courtesy.

Where we are

We serve Florianópolis and Greater Florianópolis

Our store is inside Floripa Shopping. If you prefer, we pick up your iPhone at your home.

Store at Floripa Shopping

Help Cell, Floripa Shopping
Rod. Virgílio Várzea, 587, Saco Grande
Florianópolis, SC, 88054-605

Mon–Sat, 10am–10pm. Sunday, 2pm–8pm (no technical service).
WhatsApp +55 48 99110-7381

Pickup and delivery across Greater Florianópolis, for any service, for a fee.

Chat on WhatsApp

Reviews

What customers say after their iPhone repair

Real reviews from people who had their iPhone repaired at Help Cell, straight from Google.

Matheus looked after me very well! He was super attentive and managed to help me with my phone, which had dirt in the charging port. He fixed it quickly and explained everything clearly. Excellent service!

Lohanny GvnGoogle review, May 2026

Efficient service on WhatsApp from Mykael and in the store from Josué. Excellent service! I took my phone in to replace the charging connector, but the technician checked it and, after a cleaning, found that the replacement was not necessary. The store did not charge for the cleaning either. Transparent, honest service and quality work. I recommend Help Cell!

Bruno CamargoGoogle review, Aug 2026

I love this store, and Matheus's service definitely makes all the difference. He deserves the best rating possible! I recommend the store with my eyes closed and I will happily buy here again. Score: 10000.

Karina Fretta De OliveiraGoogle review, Jul 2026

Questions

Frequently asked questions about iPhone with no signal or Wi-Fi

How much does it cost to fix an iPhone with no signal?

The price depends on where the fault is and on the iPhone model. Describe the problem on WhatsApp +55 48 99110-7381 and Help Cell replies with the price for your case.

Can an iPhone with no signal just be the SIM?

Yes. A SIM that isn’t seated right, is dirty or is faulty is a common cause. Test the SIM in another phone: if it works there, the problem is in the iPhone and a bench check is worth it.

How long does the check take?

The time depends on the fault. The first test usually shows quickly whether it is something simple or physical, and the store tells you the time before doing the repair.

Will I lose my iPhone’s data?

The check and the signal repair do not require erasing the phone. Even so, if the iPhone still turns on, back it up first. Help Cell also does data backup.

My iPhone lost Wi-Fi after falling in water. What should I do?

Turn it off, don’t charge it and bring it in as soon as you can. If liquid got in, the priority is chemical cleaning, because corrosion keeps working even when the phone looks dry.

Is Bluetooth that won’t connect also an iPhone fault?

It can be the iPhone or the accessory. If no headphones or watch connect and Wi-Fi also fails, the fault is likely in the phone. If only one accessory fails, try forgetting the pairing and pairing it again.

Does the signal repair come with a warranty?

Yes. The 90-day warranty covers the repair against defects. It does not cover drops, liquid or misuse after delivery.

Do you pick up and deliver the iPhone?

Yes. Pickup and delivery covers Greater Florianópolis, for any service, for a fee.

Other repairs

Other iPhone repairs

If the problem isn’t only the signal, see the repairs most often requested along with it, or go back to iPhone repair in Florianópolis.

Describe your iPhone’s signal problem

Send the model and what is failing, and get guidance from Help Cell. Prefer the phone? Call +55 48 3238-7381 or see the contact page.