Summary: It is slow Wi-Fi AC, but it is a very acceptable trade-off over single band N 2.4Ghz. NFC – at this price is great.

Sound

Sound 3.5mm audio jack
Earpiece speaker
Down-firing speaker (stereo with the earpiece)
Mics: 2
Google Assistant: Yes
FM Radio: Yes (not tested)
Codecs: SBC
Formats: MP3, AAC, FLAC, OGG, WMA, WAV and more

Few earpiece/single speaker phones do well with music – this is no exception. Maximum volume was 74dB, but it was too harsh and had too much distortion. At 65dB, this was back to acceptable listening levels.

Our spectrum analysis determined (Note: Frequency response is from 20Hz to 20kHz)

UMIDIGI F1 sound
  • Deep Bass: 20-40Hz – none
  • Middle Bass: 40-100Hz – none
  • High Bass: 100 to 200Hz – none
  • Low-mids: 200-400Hz – none
  • Mids: 400-1000Hz – starting to creep in and flatten (good)
  • High-mids: 1-2kHz – flat (good)
  • Low-treble: 2-4kHz – flat (good)
  • Treble:4-6kHz  – flat (good)
  • High Treble: 6-10kHz – declining
  • Dog whistle: 10-20kHz – none

It is a bright vocal signature – quite clear and crisp for voice but too shrill for music and movies.

Bluetooth: 4.1 is an old standard and only supports single point connections and SBC codec. Sounds were as good as SBC gets using our reference BT headphones.

Handsfree: Adequate volume and crisp sound. Dual mics do not appear to support noise cancellation, and you need to place the phone quite close to your mouth.

Other

Other GPS, GLONASS, BeiDou
e-compass
All necessary sensors
FM Yes
Fingerprint Rear sensor
Face ID 2D recognition

GPS was a little slow; sometimes you can be 5-10 metres past a turn. I suspect this is due to too many apps running in the background. We found a DuraSpeed setting that effectively disabled much of the background activity and gave preference to the main running app. That worked a treat.

The fingerprint sensor was ‘iffy’ working first time about 60% of the time. Face ID was fast and accurate about 90% of the time.

Battery

Battery 5150mAh Li-Ion
  Charger type: USB-C 5V/2A, 9V/2A, 12V/1.5A (18W)
MediaTek Pump Express fast charge 75% in 40 minutes and a full charge in 2 hours
Approx recharge time using standard 5V/2A charger is just under 3 hours

The battery is very large for this class of device.

Tests:

  • 1080p Video loop, 50% brightness, Airplane mode – 16 hours
  • Under 100% load, maximum brightness and everything turned on it was empty in just over 6.75 hours
  • Given typical use we expect this to run 48+ hours between charges.

Summary: Buy it for the amazing battery capacity alone!

4G/LTE

LTE Cat: 7 300/100Mbps
Bands : 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28A, 28B, 34, 38, 39, 40 and 41
Covers Australian needs and so much more
Sim Dual (hybrid with microSD)
Both sims can be LTE, but the manual says to select your 4G sim to call out on
Other VoLTE and VoWiFi (or VoWLAN) depends on the carrier

It achieved a -83dBm strong signal. We are not sure if it covers 20+ LTE bands but appears to do so.

It receives calls on both sims (only one at a time) but defaults to call out via the nominated sim.

Download/upload speed over LTE was 100/25Mbps – fair.

LTE Summary: If it indeed does support 20+ LTE bands and with dual sim, it would be a great international travelling companion.