VoLTE & the 3G Shutdown: Why Older Phones Lost Service
Why 3G Networks Shut Down
All three major US carriers — AT&T, T-Mobile, and Verizon — have shut down their 3G networks. AT&T shut down 3G in February 2022. T-Mobile shut down its 3G UMTS network in July 2022 and Sprint's 3G CDMA network in March 2022. Verizon completed its 3G CDMA shutdown at the end of 2022. The shutdowns freed up spectrum — the radio frequencies that carry wireless signals — for 4G LTE and 5G services, which are more efficient and can serve more users at higher speeds on the same frequencies. The transition was inevitable but left millions of people with older phones suddenly unable to make calls.
What Is VoLTE and Why It Matters Now
VoLTE stands for Voice over LTE. Before VoLTE, phone calls on LTE networks were handled by falling back to the 3G network — your phone would switch from 4G to 3G to make a call, then switch back to 4G after hanging up. With 3G networks gone, there is no fallback available. VoLTE handles voice calls directly over the 4G LTE network, eliminating the need for 3G entirely. VoLTE calls connect faster (typically one to two seconds versus six to eight seconds on 3G), sound clearer (wideband audio at higher bitrates), and allow simultaneous data use during calls (you can browse the web while on a phone call). Every phone sold by major US carriers since approximately 2019 supports VoLTE, but older phones — particularly budget models, imported phones, and phones originally sold in other countries — may lack VoLTE support on US networks.
Phones That Lost Service
The 3G shutdown affected several categories of devices. Basic phones and flip phones manufactured before 2018 that relied on 3G for voice calls stopped working entirely. Older smartphones that supported 4G LTE data but lacked VoLTE certification on US carriers lost the ability to make calls even though data still worked. Imported or unlocked phones sold without US carrier VoLTE certification sometimes lost calling capability even if the hardware theoretically supported VoLTE. Some medical alert devices, home security systems, vehicle telematics modules, and IoT devices that used 3G modems also lost connectivity and required replacement or upgrade. If you still have a device that cannot make calls, the issue is almost certainly a lack of VoLTE support — the fix is a phone upgrade.
How to Check If Your Phone Supports VoLTE
On iPhone, VoLTE is supported on iPhone 6 and later on all three US carriers. To verify it is enabled: go to Settings, then Cellular, then Cellular Data Options, then Voice and Data — if LTE or VoLTE is selected, you are set. On Android, the path varies by manufacturer: typically Settings, then Network and Internet (or Connections), then Mobile Networks, then look for VoLTE or Enhanced 4G LTE calling and ensure it is toggled on. If you do not see a VoLTE option, your phone may not support it on your current carrier's network. Some phones support VoLTE on one carrier but not another — this is a carrier certification issue, not a hardware limitation.
What About 2G?
T-Mobile still operates a 2G GSM network as of mid-2026, though its long-term future is uncertain. AT&T shut down 2G in 2017. Verizon never operated a GSM 2G network (Verizon used CDMA, which is fully shut down). The remaining T-Mobile 2G network serves some IoT devices and very old phones, but carriers have made clear that all legacy networks will eventually be retired to free spectrum for 5G expansion. If you have a device that still relies on 2G, planning a transition to a VoLTE-capable device is wise.
Impact on Connected Devices
The 3G shutdown affected more than just phones. Home security systems from older installations that used 3G cellular modems for alarm communication needed module upgrades. Vehicle telematics and OnStar-type systems in cars manufactured before approximately 2019 lost connected services. Medical alert pendants and fall detection devices with 3G modems stopped communicating with monitoring centers. Vending machines, fleet tracking devices, and other commercial IoT equipment on 3G needed upgrades. If you have any connected device that has not communicated since 2022, check whether it used a 3G modem and needs a 4G/5G replacement.
If you are shopping for a new phone and want to ensure compatibility with your carrier, see our upcoming Phone Network Bands Guide. For flip phone options that support VoLTE, check our Best Flip Phone Plans roundup.
5G and the Future of Voice Calling
As 5G networks expand, carriers are beginning to implement VoNR — Voice over New Radio — which handles voice calls directly over 5G without falling back to 4G LTE. VoNR offers even faster call connection times and higher audio quality than VoLTE. Currently, VoNR is available in limited areas and on specific phone models. For most users, VoLTE will remain the primary voice technology for years to come. The transition from VoLTE to VoNR will be gradual and largely invisible to consumers — your phone will use VoNR when available and fall back to VoLTE elsewhere, similar to how data switches between 5G and LTE based on availability.
What About WiFi Calling?
WiFi calling is a complementary technology that routes voice calls over a WiFi network instead of the cellular network. It works regardless of your cellular coverage — as long as you have a WiFi connection, you can make and receive calls. WiFi calling is especially valuable in areas with poor cellular reception, such as basements, concrete buildings, and rural homes. Most carriers and MVNOs support WiFi calling on VoLTE-capable phones. Enable it in your phone's settings: on iPhone, go to Settings, then Phone, then WiFi Calling. On Android, check Settings, then Network, then WiFi Calling. WiFi calling does not consume your cellular minutes on most plans — it uses your regular plan allotment as if you were on the cellular network.
Checking VoLTE Certification for Unlocked Phones
If you are buying an unlocked phone from a third-party retailer or internationally, verifying VoLTE certification is critical. Each carrier maintains a list of devices approved for VoLTE on their network. T-Mobile publishes a device compatibility checker on their website where you can enter your phone's IMEI to verify support. AT&T and Verizon have similar tools. A phone may have the hardware capability for VoLTE but lack the carrier-specific firmware or certification needed to activate it. Before purchasing an unlocked phone, check it against your carrier's compatibility list to avoid buying a device that cannot make calls on your network.
Frequently Asked Questions
Why did my old phone stop making calls?
All US carriers shut down their 3G networks in 2022. Phones that relied on 3G for voice calls lost calling capability. The fix is upgrading to a phone that supports VoLTE (Voice over LTE).
What is VoLTE?
VoLTE (Voice over LTE) handles phone calls directly over the 4G LTE network. It replaced the old method of falling back to 3G for calls. VoLTE delivers faster call connections, clearer audio, and allows data use during calls.
Do all phones support VoLTE?
All iPhones from the iPhone 6 onward and virtually all Android phones sold by US carriers since 2019 support VoLTE. Older phones, imported phones, and some budget models may not.
Is 2G still working in the US?
T-Mobile still operates a 2G GSM network as of mid-2026, but its long-term future is uncertain. AT&T shut down 2G in 2017 and Verizon never had a 2G GSM network.