SolQvia.com

English technical companion · checked 2026-08-08

シンプルスマホ6 (SoftBank sales variant) on Japan's 4 carriers: bands, eSIM, VoLTE & APN

Check Simple Smartphone 6 by exact Japan sales variant for NTT Docomo, au, SoftBank and Rakuten Mobile, including LTE/5G bands, SIM/eSIM, VoLTE/IMS and APN boundaries.

Updated: 2026-08-09Evidence: SolQvia structured records + primary-source links from the Japanese companion
On this page
  1. Summary / device record
  2. Diagnostic order
  3. Official sources

What this exact variant is

DeviceSimple Smartphone 6
Model numberNot specified
Original sales channelSoftBank
Release date2022-04-08
SIM / eSIMVerify on the exact official model specification page.
LTE bandsB18/B26 / B19 / B8 / B3 / B1
5G bandsn3 / n28 / n77 / n78
VoLTE / IMSOfficially supported on the selling carrier. For another carrier, evaluate bands separately from IMS/VoLTE and carrier support.
FeliCaVerify on the exact official model specification page.

This page evaluates the exact sales variant, not only the marketing name. A Japan carrier model, manufacturer SIM-free model and overseas model can differ in SIM layout, supported radio bands, FeliCa and carrier provisioning behavior.

Compatibility across Japan's four major carriers

Target networkSolQvia ratingBasisImportant boundary
NTT DocomoMajor-band fitTechnical fit assessmentVerify plan, VoLTE/IMS and carrier support separately.
auMajor-band fitTechnical fit assessmentVerify plan, VoLTE/IMS and carrier support separately.
SoftBankStrongest fitTechnical fit assessmentVerify plan, VoLTE/IMS and carrier support separately.
Rakuten MobileMajor-band fitTechnical fit assessmentVerify plan, VoLTE/IMS and carrier support separately.

Rating meaning: “Strongest fit” generally indicates the original selling carrier or direct primary-source support. “Major-band fit” means key radio bands are present, but it does not prove VoLTE/IMS, SMS, emergency calling, carrier aggregation, 5G SA or support eligibility.

Safe order when moving this phone to another carrier

  1. Confirm the model number. Check Settings/About or the regulatory label. Do not rely on the product name alone.
  2. Confirm the SIM path. Verify physical SIM versus eSIM support before ordering or reissuing a line.
  3. Check the target carrier's key LTE bands. Missing a low-band coverage layer can affect indoor and rural usability even if service connects in some locations.
  4. Provision the line. For eSIM, add and enable the carrier-issued profile first. APN values are not eSIM activation credentials.
  5. Check data, voice and SMS separately. Data working does not prove VoLTE/IMS voice support.
  6. Check 5G last. Verify n77/n78/n79, plan eligibility, coverage and NSA/SA conditions after LTE is stable.

Japan vs overseas model boundary

Not verified

When importing or reusing an overseas model in Japan, also verify the exact regional model, Japan regulatory compliance/technical conformity, emergency-call behavior and carrier support. Do not infer these from a visually identical model sold in another market.

Related English guides

Primary and official sources

Carrier procedures and product specifications can change. Re-check the current official page immediately before a SIM/eSIM migration, MNP request, purchase or imported-device use.

Phase111 / Exact variant differentiation

Separate the SoftBank sales record from other Japan variants of シンプルスマホ6

This page evaluates the SoftBank sales record, not the marketing name alone. SolQvia currently has 1 Japan sales record(s) under this model name: SoftBank. The differences below are differences in what the primary-source tables list; they are not automatic claims about the radio hardware's complete global capability.

This sales recordシンプルスマホ6 / SoftBank / model number not registered
Official check date2026-08-08
Primary-source links1
Four-carrier technical fitNTT Docomo:○ / au:○ / SoftBank:◎ / Rakuten Mobile:○

Differences visible in the source frequency tables

  • LTE listed here but not in the sibling sales-record tables: 26 / B1 / B3 / B8 / B18 / B19.
  • LTE listed in at least one sibling sales-record table but not listed here: none.
  • 5G NR listed here but not in the sibling sales-record tables: n3 / n28 / n77 / n78.
  • 5G NR listed in at least one sibling sales-record table but not listed here: none.
How to read this: absence from one carrier frequency table is not treated as proof that the hardware lacks that band. Carrier tables may describe a sales variant or domestic-use scope rather than every global hardware band. VoLTE/IMS, APN, eSIM provisioning and carrier certification remain separate checks.

Evidence gaps still open for this record

  • No SolQvia real-device observation
  • No SolQvia real-device voice/SMS/RCS confirmation
  • Dual-SIM capability needs exact-model confirmation
  • Satellite/direct-to-device path is unregistered or not listed

Open the Device Passport for evidence and open gaps →