What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
If your Android phone has weak or no cellular reception but the SIM line is active, Wi-Fi Calling may let you make carrier calls over a Wi-Fi connection. It will not fix an inactive or damaged SIM, restore mobile data, or resolve a carrier provisioning problem. First check the selected SIM or eSIM and your carrier’s support for Wi-Fi Calling; then enable the feature and test a call.
First, tell weak signal from a SIM error
“Out of service” can describe different problems. Weak cellular reception may prevent calls even though the SIM is active. A “No SIM” message or another SIM error points to a different diagnostic path. Wi-Fi Calling can help with voice calls over the internet when the carrier supports it, but it does not restore cellular registration or mobile data. Google notes that not all carriers support calls over Wi-Fi: Google Phone Help: Make calls over Wi-Fi.
On a dual-SIM phone, make sure you are checking the line you intend to use. Wi-Fi Calling support and requirements can depend on the carrier, device, plan, and country. A missing setting is not, by itself, proof that the phone is defective.
Check and enable Wi-Fi Calling on Android
- Confirm the line is active. Open the selected carrier SIM’s settings and verify that the intended SIM or eSIM is active. Samsung says Galaxy Wi-Fi Calling requires active service via SIM or eSIM: Samsung Support: Turn on Wi-Fi Calling on Galaxy phones.
- Find the setting. The path varies by phone and carrier. On many Android phones, try Settings > Network & internet > SIMs > [carrier SIM] > Wi-Fi calling. On Samsung Galaxy, try Settings > Connections > Wi-Fi Calling. Motorola documents Settings > Network & internet > Mobile network > SIM > Wi-Fi calling; some carriers place it in the Phone app’s calling-account settings. Google Fi users can also enable it in the Fi app. See Google Fi Wireless Help: Make calls over Wi-Fi and Motorola Support: Make calls over Wi-Fi.
- Turn it on and finish setup. Follow any carrier prompts, which may include accepting terms or entering an emergency address. Requirements such as HD Voice or VoLTE depend on the carrier, device, and location; for example, Verizon’s published requirements apply to Verizon service, not every Android line: Verizon Support: Wi-Fi Calling at Verizon FAQs.
- Connect to Wi-Fi and test a call. A successful call may show “Internet Call,” “Wi-Fi calling,” or a Wi-Fi icon, depending on the phone and carrier. When both Wi-Fi and cellular service are available, carrier settings determine which connection the phone uses. Google says some carriers may allow Wi-Fi calls without cellular service; do not assume every carrier does.
If Wi-Fi Calling is missing or will not activate
When the setting is absent
Check whether the carrier supports Wi-Fi Calling on your exact device and line. Eligibility or carrier configuration may explain a missing option. Google Fi also suggests checking for a Carrier Services update in its setup guidance. If the carrier confirms the feature is supported but the setting remains unavailable, ask it to verify provisioning for the line.
#1 Best Overall
- NO CONTRACT: Pay $5 - $25/month for a fully customizable phone plan - choose your talk, text, and data with no strings attached; upgrade, downgrade or cancel your plan anytime with no penalties
- UNIVERSAL SIM CARD INCLUDED: The kit contains one three-in-one SIM card (nano, micro, and standard sizes) to fit most unlocked GSM-compatible smartphones
- NATIONWIDE 5G COVERAGE: Stay connected coast to coast with nationwide coverage on America's largest 5G network
- INTERNATIONAL CALLS TO 60+ COUNTRIES: All Tello plans include international calling to over 60 countries
- EASY ACTIVATION: Bring your own phone and activate your SIM on the Tello website; check your phone compatibility and coverage maps before purchasing to confirm service in your area
When setup fails or calls do not connect
Confirm that Wi-Fi works reliably, complete any carrier setup prompts, and restart the phone. Google’s troubleshooting guidance says reactivation by the carrier may be needed for Wi-Fi Calling problems: Google Pixel Phone Help: Fix mobile connectivity issues. A Wi-Fi problem can prevent Wi-Fi calls even when the SIM and account are fine.
When the phone reports a SIM error
Treat a SIM error separately from weak reception. If practical, try another SIM in the phone or test the suspect SIM in another phone to help isolate the issue. Avoid handling or reseating a physical SIM unless you can do so safely and know how to use your phone’s SIM tray. A different test result can help narrow the fault, but the carrier must confirm whether the line and SIM or eSIM are active.
Rank #2
- Cellular Service for Just $5: One of the lowest and most affordable subscription plans! Includes 100 talk minutes, 100 texts, and 100MB of ultra-fast data with your prepaid SIM card. No contracts!
- Easy Activation: A valid credit card is required for activation. No contracts, Cancel anytime. SpeedTalk Mobile offers its services through subscription plans. You can also call us for assistance 7 days a week with live technical support when you contact our toll-free number.
- Universal Compatibility: Bring your own phone and use any compatible device on the SpeedTalk Mobile network. The SIM card can be used to activate any unlocked 5G, 4G LTE, and VoLTE-compatible phone, including iPhones, Android devices (Samsung Galaxy, Google Pixel, LG), Windows phones, and non-smartphones. Our triple-cut SIM card is designed in three sizes (Mini/Micro/Nano) to ensure compatibility with a wide variety of devices. Simply punch out the size that fits your device and insert it.
- How does it work: The SIM Kit includes a 3-in-1 SIM card (standard, micro, and nano sim card) to fit all SIM Devices. Also it supports eSIM activation on Apple, Google, Samsung devices.
- eSIM: During activation, you can choose to use your physical SIM or switch to eSIM. The eSIM is available on iPhone 11 and newer models, Google Pixel 2 and higher, and compatible Samsung devices.
Use resets cautiously
Google lists powering the phone off for 30 seconds, cycling airplane mode, and resetting network settings among Pixel connectivity troubleshooting steps. A network reset can delete saved Wi-Fi connections, so do not start with it when an account, SIM, or carrier issue is plausible. Consult Google’s Pixel guide for the applicable steps and effects.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →What to ask your carrier
If the setting is absent, activation fails, or service remains unavailable, contact the carrier and ask it to check:
Rank #3
- No Catch: Enjoy the Unlimited Plan for just $22 mo forever. No annual contract, no hidden fees, and no changes to your bill.
- Activate with any unlocked Apple iPhone, Google phone, or Samsung smartphone using SpeedTalk Mobile’s affordable nationwide wireless service plans, available for purchase upon activation. Other plans available starting at just $5/mo.
- How does it work: The SIM Kit includes a 3-in-1 SIM card (standard, micro, and nano sizes) to fit most unlocked devices and supports eSIM activation on Apple, Google, and Samsung devices (please see the device compatibility chart in this listing). Activation is required to begin SpeedTalk Mobile service.
- eSIM: Bring your own unlocked phone, keep your current number (or get a new one), and activate online in minutes. During activation, you can choose to keep using your physical SIM or switch to eSIM. The eSIM is available on iPhone 11 and newer models, Google Pixel 2 and higher, and compatible Samsung devices.
- Easy activation: Valid credit card is needed at activation, No contracts, Cancel anytime. Speedtalk Mobile offers its services through subscription plans.
- Whether Wi-Fi Calling is supported and provisioned for your specific device and line.
- Whether the physical SIM or eSIM and account are active.
- Whether there is a local outage or a recent plan or account change affecting service.
- Whether you must complete an emergency-address or other setup requirement.
Emergency calls over Wi-Fi: check local rules
Emergency calling requirements vary by country and carrier. In the United States, Verizon says its registered address informs emergency call routing and warns that an incorrect address or a Wi-Fi or internet disruption can affect emergency response. Motorola also advises updating the emergency address after moving and telling the 911 operator your actual location. Follow your carrier’s local instructions, keep any required registered address current, and give emergency services your real location.
Quick Recap
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.
