My iPhone 16 Pro Max running iOS 27 has no native IPv6 on Swisscom, using either 5G or LTE.
I’ve tested automatic carrier settings, a custom IPv4v6 APN and an IPv6-only APN. IPv4v6 provides only IPv4; IPv6-only fails to activate mobile data.
Another Swisscom SIM in my Teltonika RUTC50 successfully establishes native IPv6 using gprs.swisscom.ch. But that one has another issue, it works only with IPv6 not with IPv4v6, probably a router firmware issue.
iPhone 16 Pro Max, iOS 27
Swisscom primary eSIM
APN: gprs.swisscom.ch
Requested family: IPv4v6
2026-10-10 21:10:07
QMI WDS Packet Service Status (0×0022)
IP family: IPv6
Verbose reason type: 3GPP (6)
Reject cause: 55 (0×37)
ESM cause #55:
Multiple PDN connections for a given APN
not allowed.
Internet context 0 remains active with IPv4.
IMS context 1 has IPv6 connectivity.