3G by Jay — Third-generation mobile networks: the real | 3gbyjay.com
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3G by Jay — Third-generation mobile networks: the real | 3gbyjay.com

3G speeds and shutdown dates

The 3G label hides four very different speed classes. The original IMT-2000 targets were 144 kbps in a moving vehicle, 384 kbps for a walking user and 2 Mbps stationary indoors — HSPA later multiplied those figures.

Every 3G network has a finite life. Once a carrier publishes a switch-off date, a 3G-only phone loses service on that day, and any handset without VoLTE loses the ability to make calls.

Coverage depends on bands, not logos. UMTS Band I runs at 2100 MHz with 1920–1980 MHz uplink and 2110–2170 MHz downlink, while refarmed 900 MHz spectrum extends rural reach.

Step by step: will your phone still work after 3G closes?

Five checks in order, from the spec sheet to a live test call.

Start with the device, not the carrier. Find the manufacturer's spec sheet, list every UMTS band the phone supports, and look for a VoLTE or 4G-calling option in the mobile network settings.

Then match phone to network. UMTS Band I at 2100 MHz is the classic 3G band, with refarmed 900 MHz filling rural gaps; a phone missing the carrier's band never had full coverage to lose.

Finish with a real test. Set the phone to LTE-only mode and place a call: if it connects and stays on 4G, voice survives the switch-off; if it drops, the handset still depends on 3G for calls.

  • 1. List the phone's UMTS bands from its spec sheet — typical failure: band mismatch with the carrier.
  • 2. Confirm the carrier's published 3G shutdown date — AT&T closed 3G on 22 February 2022, Verizon on 31 December 2022.
  • 3. Check for VoLTE or 4G-calling support — typical failure: no VoLTE toggle on an imported handset.
  • 4. Enable VoLTE and confirm the carrier has provisioned it — typical failure: data works but calls fall back to 3G.
  • 5. Place a test call in LTE-only mode — typical failure: the call drops to 'emergency calls only'.

What speed does 3G actually give?

Between 144 kbps and 2 Mbps on the original standard, depending on how fast you move.

The IMT-2000 targets define three classes: 144 kbps in a moving vehicle, 384 kbps for a walking user and 2 Mbps for a stationary device indoors. They are peak rates, shared by every user in the cell.

The radio underneath is W-CDMA: one 5 MHz carrier running at a 3.84 Mcps chip rate. When the cell is busy, real throughput sits well below the headline figure.

In practice, 144 kbps covers messaging and email, 384 kbps covers basic browsing, and only the 2 Mbps indoor class felt like a slow fixed line.

Once a carrier drops 3G, a handset needs VoLTE support to call over 4G — there is no circuit-switched fallback left.
42 Mbps was the ceiling of the 3G family; LTE Category 4 passed it three and a half times over on a single 20 MHz carrier.

The procedure: five checks before you trust a device

How HSPA raised the ceiling

HSDPA climbed from 3.6 to 14.4 Mbps, and dual-carrier HSPA+ peaked at 42 Mbps.

HSDPA started at 3.6 Mbps downlink, then rose through 7.2 to 14.4 Mbps as handsets gained support for faster modulation — each step on the same 5 MHz carrier, with no new spectrum required.

Dual-carrier HSPA+ bonds two carriers for a 42 Mbps peak. Some carriers marketed it as 4G, but it remains an evolution of the 3G family.

LTE Category 4 reaches 150 Mbps on a 20 MHz carrier, about 3.5 times the HSPA+ ceiling — the arithmetic behind every refarming decision.

Which UMTS bands does a phone need?

Band I at 2100 MHz for the core network, 900 MHz where rural coverage matters.

UMTS Band I runs at 2100 MHz: 1920–1980 MHz uplink and 2110–2170 MHz downlink. It was the launch band of the first commercial 3G service, NTT DoCoMo's FOMA network in Japan in October 2001.

Lower frequencies travel further, so carriers refarmed 900 MHz spectrum from 2G to widen rural 3G coverage. A Band-I-only phone can show full bars in a city and nothing at all in the countryside.

The check is simple: read the spec sheet, find the UMTS or W-CDMA band list, and confirm both 2100 MHz and 900 MHz appear before relying on the device outside urban areas.

When will 3G be shut down — and what breaks?

Network by network, on published dates: AT&T on 22 February 2022, Verizon on 31 December 2022.

There is no single global date; each carrier sets its own. In the United States, AT&T shut down its 3G network on 22 February 2022 and Verizon closed its 3G CDMA network on 31 December 2022, refarming the spectrum to 4G and 5G.

Voice fails first and quietest. 3G carries calls on circuit-switched channels, so once a carrier drops 3G, a handset needs VoLTE support to call over 4G; without it, mobile data works and calls do not.

The failure names are consistent across carriers, and each one points to a different cause — read the symptom before replacing the phone.

  • 'No service' — a 3G-only device past its carrier's shutdown date.
  • 'Emergency calls only' — the phone sees a network but cannot register for normal service.
  • Data works, calls fail — a 4G handset without VoLTE support or provisioning.
  • Calls drop away from Wi-Fi — voice was riding on 3G all along.

Speed comparison: 3G, HSPA+ and LTE

Downlink speeds across the 3G family and its 4G successor
Network stagePeak downlinkRadio carrierWhat it feels like
IMT-2000, moving vehicle144 kbps5 MHz W-CDMAMessaging and email
IMT-2000, walking user384 kbps5 MHz W-CDMABasic web browsing
IMT-2000, stationary indoors2 Mbps5 MHz W-CDMAA slow fixed-line feel
HSDPA, first release3.6 Mbps5 MHz W-CDMAUsable mobile internet
HSDPA, later releases7.2–14.4 Mbps5 MHz W-CDMAStandard-definition streaming
Dual-carrier HSPA+42 MbpsTwo bonded 5 MHz carriersThe 3G family's ceiling
LTE Category 4150 Mbps20 MHz carrierAbout 3.5× the HSPA+ peak
Downlink speeds across the 3G family and its 4G successor

The 3G family in figures

Each card is one stage of the family, from the IMT-2000 baseline to the LTE successor.

October 2001NTT DoCoMo launches FOMA in Japan — the first commercial 3G service.22 February 2022AT&T shuts down its 3G network in the United States.31 December 2022Verizon closes its 3G CDMA network.
3G's first launch and its first big shutdowns
IMT-2000UMTSW-CDMAHSDPA
The key terms of this guide, drawn to one scale

Sources

The list below names the standards and carrier announcements behind the numbers on this page.