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5G is now standard on most new phones, but “5G phone” can mean very different things. Speeds, coverage, battery use and compatibility depend on the bands in the phone and the network of your carrier. This guide explains what to check so you do not buy a 5G phone that cannot use 5G where you live.

This guide draws on product listings and general industry knowledge, not our own testing. Confirm the supported bands on the product page and with your carrier.

By the Reviewstook Editorial Team. Last updated: October 31, 2026.

Concept illustration of smartphones with SIM cards, padlock symbols and a cell tower.
AI-generated conceptual illustration; not a photograph of a specific product or a hands-on test.

What 5G Really Means

5G comes in flavors. Low-band 5G offers wide coverage with speeds only a little better than 4G. Mid-band 5G, often called C-band or sub-6, balances coverage and speed and is what most people experience. Millimeter-wave (mmWave) 5G is extremely fast but has very short range and is limited to some city areas. Which one you get depends on your carrier and location, not just the phone.

Check Band Compatibility

A phone must support the bands your carrier uses. Unlocked phones sold in one region may lack some bands used in another. Look up your carrier’s required bands and compare them against the phone specifications, or use the carrier’s device-compatibility checker.

mmWave or Not

Many midrange phones omit mmWave to save cost. For most people this is fine, because mmWave coverage is limited. If you live or work in an area with mmWave coverage and want the very top speeds, check that the model includes it.

Battery and Heat

5G radios can use more battery than 4G in weak coverage areas. Phones often switch to 4G when 5G is not needed. Look for a large battery and good efficiency, and check settings that let you limit 5G when battery matters most.

Budget Options

5G phones are available at every price. See our lists for under $300, under $500 and under $600, and brand lists for Samsung and Motorola.

5G Beyond the Phone

If you want home or travel internet, a 5G mobile hotspot can be an option; see our 5G mobile hotspots.

Unlocked or Carrier Phones

Carrier phones are tested for their network and may have deals; unlocked phones offer freedom. Check the carrier’s policy on unlocking and the phone’s warranty in your country.

Frequently Asked Questions

Do I need a 5G phone?

Not necessarily, but most new phones include 5G, and it gives better speeds and capacity where available.

Does 5G drain the battery?

It can in weak coverage areas. You can switch to 4G in settings when battery matters.

What bands do I need?

Those your carrier uses. Check with the carrier.

Is mmWave important?

Only if you live in an area with mmWave coverage and want the fastest speeds.

Bottom Line

Check the bands against your carrier, decide whether mmWave matters where you live, and pair the 5G radio with a good battery. See our best unlocked 5G phones for specific picks.

More 5G Phone Guides