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If iPhone calls, texts, and cellular data all stop working, first check whether the status bar shows SOS, No Service, or Searching: these indicate the iPhone is not connected to a cellular network. Turn Airplane Mode on for at least 15 seconds, turn it off, and restart the phone. If only one service is failing, troubleshoot that service’s connection instead—SMS, iMessage, RCS, MMS, calls, and data do not all rely on the same path.
First identify whether the failure is broad or limited
Before changing settings, note what still works. Check the status bar, try an incoming and outgoing call, send an ordinary SMS as well as an iMessage if available, and test cellular data in more than one app. If practical, repeat the test in another location. This can help distinguish a local coverage problem from a line setting or a problem with one message type or app.
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- SOS, No Service, or Searching: The iPhone is not connected to a cellular network. Start with the line, local coverage or outage, and carrier account.
- Only one function fails: Check the connection that function uses in the sections below. A failed message or green bubble alone does not establish that all cellular service is down.
Try the low-risk reconnection steps
- Toggle Airplane Mode: Open Control Center or Settings, turn Airplane Mode on, wait at least 15 seconds, then turn it off.
- Restart the iPhone: After it starts, check whether the status changes and test the affected services again.
- Run diagnostics if available: On iOS 18 or later, the Apple Support app may offer additional diagnostics on supported iPhone models.
Apple recommends the Airplane Mode and restart steps for a no-service state. If the phone remains disconnected, check the line and carrier settings next.
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Check the cellular line, SIM, and software
- Go to Settings > Cellular (called Mobile Data in some regions). Confirm the intended line is listed and turned on.
- If you use a physical SIM, remove and reinsert it. If the SIM is damaged or the line is missing, contact your carrier about a replacement SIM or eSIM setup. A SIM tool only helps with reseating a physical SIM; it cannot fix an account, network, or device fault.
- Open Settings > General > About and follow any prompt to update carrier settings.
- Check for and install an available iOS update.
Labels and available options can vary by iPhone model, carrier, and region.
#1 Best Overall
Phonetone Cell Phone Signal Booster for Band 12,13,17
- 【Ready for 5G】- The booster is designed for the largest cell carriers - Verizon and AT&T, boosts 4G LTE and 5G signal for all cellular devices operating on band 12, band 13 and band 17. Note: The booster only supports 5G band that largely deployed in current bands 12, 17 and 13 by Dynamic Spectrum Sharing by carriers. If you need a 5G cell booster, please ensure that you have a 5G phone and your carrier has deployed 5G in the 4G band of 12,13 and 17 before purchase.
- 【Advanced Features & Smart Device】- The booster uses AGC(Automatic Gain Control) function, which can intelligently detect the existing signal strength, and adjust itself for best performance, then reflect its working condition through LED indicator. Buy it once, and boost for life.
- 【Better Data & VoLTE】- Enhances 4G LTE data speed signals and volte, enjoy faster uploads and downloads to stream videos smoothly in your house, office, cottage, cabin, camper, basement etc., get rid of expensive monthly internet fees. Supports multiple users simultaneously.
- 【Powerful Antennas & Large Coverage】-This booster comes with high gain directional antenna, allow you to point it to the nearest signal tower more accurate and get more signals, expanding the indoor coverage up to 4,500sq ft. DIY Installation.
- 【Reliable Service Guarantee】- FCC Certified, 30-day return, 3-month replacement, Up to 3-year manufacturer repair, lifetime professional technical Support.
Troubleshoot the service that is failing
| Service | What it relies on | What to check |
|---|---|---|
| Phone calls | Cellular voice service and carrier setup | Review relevant call settings and software. Ask the carrier to check the account, plan setup, local outages, billing blocks, service restrictions, and carrier-system call errors. |
| SMS | A cellular network connection | If ordinary SMS will not send or arrive, verify cellular service and ask the carrier to check SMS support and the line. |
| iMessage | Wi-Fi or cellular data | In Settings > Messages > Send & Receive, check that the phone number is selected. Activating a phone number for iMessage requires SMS and carrier verification can take up to 24 hours; carrier SMS charges may apply. |
| RCS and MMS | Data connectivity and carrier support | Check data connectivity and whether the carrier supports the service. Contact the carrier if they still do not work after line and network checks. |
| Cellular data | An enabled cellular data connection on the selected line | Confirm Cellular Data is on and the intended line is selected. While abroad, data roaming may be needed; check the carrier’s plan terms and charges first. |
Check which line is handling data on Dual SIM
An iPhone can use only one cellular line for data at a time. Open Settings > Cellular > Cellular Data and check which line is selected. If data stops during a call placed on a different, voice-only line, enable Allow Cellular Data Switching if available and confirm that the carrier supports it. Apple notes that this switching does not work while Data Roaming is in use.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to contact the carrier or Apple
Contact the carrier to check account standing, local coverage and outages, billing blocks, service restrictions, plan setup, SIM or eSIM provisioning, and support for calls and messaging. These are carrier-side issues that iPhone settings alone cannot resolve. If the carrier confirms there is no account or network problem and the iPhone still cannot connect, Apple says the device may need service.
Rank #2
Cell Phone Booster for Home Office | Boosts 5G & 4G LTE | Cell Phone Signal Booster for All U.S. Carriers-Verizon, AT&T, T-Mobile & More | for Band 12/17,13,5,25/2,4 | HD Display | App | FCC Approved
- 📶 𝐁𝐨𝐨𝐬𝐭 𝐒𝐢𝐠𝐧𝐚𝐥 - HiBoost cell phone signal booster for 2000 Sq.ft. Enjoy lag-free cell phone signal, faster internet connections for streaming, faster to download and upload. High power outside antenna, receive longer distance signal. (It requires at least one bar of signal for the cell phone booster to enhance the signal.)
- 📶 𝐖𝐨𝐫𝐤𝐬 𝐎𝐧 𝐀𝐥𝐥 𝐔.𝐒. 𝐂𝐚𝐫𝐫𝐢𝐞𝐫𝐬 - HiBoost cell phone booster for home works on all cellular service providers - Verizon, AT&T, Sprint, T-Mobile, Straight Talk, and U. S. Cellular. Supports bands of 700-750MHz (band 12, 13, 17), 800-850MHz (band 5), 1900MHz (band 2/25) and 1700~2100MHz (band 4).
- 📶 𝟓𝐆 𝐂𝐨𝐦𝐩𝐚𝐭𝐢𝐛𝐥𝐞 - HiBoost cell booster for home compatible with the latest 5G and 4G LTE technology, supports multiple devices simultaneously. The lte cell booster aid to eliminate weak signal areas, continuously provide you with a reliable cellular connection so that no more dropped calls when you at home
- 📶 𝐔.𝐒. 𝐋𝐨𝐜𝐚𝐥 𝐂𝐮𝐬𝐭𝐨𝐦𝐞𝐫 𝐒𝐮𝐩𝐩𝐨𝐫𝐭 - You can easily get help from installation to use. 30-Day Money Back, 3-Year Warranty - within 3 years of receipt of delievery, for any quality issue, simply reach us and we'll solve it. HiBoost cellular service booster meet all FCC guidelines, there is no need to ask the cellular provider for their consent, no monthly subscription fees required
- 📶 𝐋𝐂𝐃 𝐚𝐧𝐝 𝐀𝐏𝐏 𝐌𝐨𝐧𝐢𝐭𝐨𝐫 𝐇𝐞𝐥𝐩 𝐄𝐚𝐬𝐲 𝐈𝐧𝐬𝐭𝐚𝐥𝐥𝐚𝐭𝐢𝐨𝐧 - The color LCD screen on the cellular boosters clearly shows the real-time signal strength, you can cooperate with a partner to locate the best installation point of the outside antenna accurately, or you can achieve the same purpose through the HiBoost Signal Supervisor APP on your own, then place the booster with whip antenna on any desktop you want to get the ideal signal boost
Do not guess APN values. Whether APN settings are visible or editable depends on carrier permission; ask the carrier for the correct settings and instructions if APN configuration is relevant to your line.
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Quick Recap
Bestseller No. 1
Rank #4
Car Cellular Phone Signal Booster & Repeater Antenna 5G, 4G LTE for Verizon At&t Sprint T-Mobile Phones by Cellet
- 1.The antenna is to be placed outside of the car window.
- 2. The square repeater is to be placed inside of the car window (Make sure the square repeater is aligned right below the antenna).
- 3. This device is to be used in automobiles only, if you want to use this at your home PLEASE READ DESCRIPTION BELOW.
- 4. For best signal improvement, the booster must be installed at least 3 feet away from your phone or installation location. This spacing allows the passive antenna to capture and redirect existing tower signal effectively.
- DISCLAIMER: Passive Booster (Non-Amplified): Does not create or amplify signal — only redirects existing signal from nearby towers. Performance Depends on Environment: Car construction, terrain, and carrier coverage impact results. Not for zero-signal areas: A minimum existing signal is required for the passive booster to redirect.
Rank #3
Sale
ZORIDA Cell Phone Signal Booster for All US Carriers, Boosts 5G 4G, Cell Phone Booster 72dB High Gain Antennas, Cellular Verizon and AT&T, T-Mobile Signal on Band 12/17,13,5,25/2,4, FCC Approved
- 【Boost Your Signal】-- The cell booster can be used without registering with the carrier. Enjoy fewer dropped calls, incredibly fast data speeds, better voice quality and worry-free streaming through ZORIDA signal booster with 72dB max gain. Enhance the signal in rural areas, home, cabin, shop, office, building, warehouse, basement or garage. Higher gain helps save your battery life of phones on standby mode. (Please ensure you have the 1-2 bars signal outside of your home before using)
- 【All US Carriers & 5G Compatible】-- ZORIDA cellular signal booster supports All US carriers from Verizon, AT&T, T-Mobile, US Cellular, and more. Works on various band 12/17, 13, 5, 4, 2/25. Boost 3G & 4G LTE, 5G signal. 5G technology allows you to experience ultra-fast and stable network connectivity at home.(Tips: If you want to use 5G, please make sure your area provides 5G service in the existing 4G frequency band before purchasing)
- 【Affordable & Effective】-- ZORIDA cell phone signal booster enhances cell signal for multiple devices simultaneously up to 2000 sq ft, and it offers an ideal solution for small homes, studios or a single room. No subscriptions or hidden fees. ZORIDA ACE 5S is an affordable yet effective way to solve your connectivity issues. (Note: the coverage range of the booster depends on your outdoor signal strength)
- 【Easy Installation & App Service】-- Cell phone signal booster for home features a compact indoor whip antenna that you can easily attach to the cellular booster, then place it on the wall or directly on the table. By registering ZORIDA APP, we provide online 1v1 technical support to guide installation. You can also find the best installation place of outdoor antenna, view step-by-step videos and instructions, and see your signal data before and after Installation.
- 【US-based Service & FCC IC Certified】-- FCC & IC Certified. ZORIDA cell booster for home promises 30-day money-back and a 3-year warranty. Lifetime US-based tech-support-online app chat, phone and email; Contact with us anytime anywhere when you need.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
