Phase102 · Communication Compatibility Lab
A recognized SIM and working data connection do not prove VoLTE/IMS, calls, SMS or RCS. Record device, exact variant, OS, carrier, SIM mode, messaging app and peer conditions separately.
Do not submit IMEI, EID, ICCID, phone number, name, address, authentication codes or eSIM QR data.
| Function | Result |
|---|---|
| voice VoLTE / IMS registration and voice-service state | |
| voice Outgoing voice call | |
| voice Incoming voice call | |
| voice 4G/5G data during a voice call | |
| sms SMS sending | |
| sms SMS receiving | |
| sms SMS one-time-code reception | |
| rcs RCS registration / connected status | |
| rcs RCS text sending | |
| rcs RCS text receiving | |
| rcs RCS media/file transfer | |
| rcs RCS read receipts / typing indicators | |
| rcs SMS/MMS fallback when RCS is unavailable | |
| voice Wi-Fi Calling (where offered) |
No report generated yet.
Official source layer
Carrier RCS eligibility is maintained separately from RF/band data. Because conditions change, the checked date and primary URL are retained.
As of 2026-08-08, Docomo’s official RCS page lists Android phones/tablets on Android 10+ and says iPhone availability will be announced later. An eligible internet-access service is required; Docomo-network MVNO support is listed as future support.
Official source ↗au officially lists au, UQ mobile, povo and au-network MVNO lines. A line that cannot use SMS cannot use RCS. The published OS floor is Android 8+; iPhone requirements vary by line type between iOS 18.4+ and iOS 26.2+.
Official source ↗SoftBank officially lists RCS for SoftBank, Y!mobile and LINEMO. Android requires Android 10+ with Google Messages; iPhone requires iOS 26.4+ with Messages. Business and MVNO lines are listed as future support.
Official source ↗Rakuten Mobile documents cases where Android “chat features” affect whether messages are received in Rakuten Link. This ledger does not infer general Rakuten-line RCS eligibility from that FAQ alone.
Official source ↗Apple states that RCS requires iOS 18+ and a carrier/cellular plan that supports RCS on iPhone. The presence of the toggle alone does not prove successful end-to-end RCS messaging.
Official source ↗Google Messages exposes RCS states such as connected, connecting, unable to connect and unsupported. SMS/MMS fallback behavior is configured separately when RCS delivery fails.
Official source ↗