congstar Homespot & Go – congstar defaults to the Telekom IPv6 network if a website or app does not fully support IPv6 the provider’s NAT64 gateway must translate it if this gateway glitches DNS succeeds but the page won’t open
Fix: Change your APN profile from internet.v6.telekom to the legacy fallback internet.telekom (or internet.congstar) and ensure the APN protocol is set to IPv4/IPv6 (Dual Stack) instead of IPv6-only