I frequently travel with my Samsung Z Fold3, without any issues.
However, I am in London, UK from last 3 days, and unable to use my SIM Cards.
When both SIMs are enabled, none of them work, I get an error say “Not registered on network”,
When I enable SIM 1 only, I get an error say “Not registered on network”,
When I enable SIM 2 only, it works fine.
Both, SIM cards and the phone have no limitation or restrictions, plus I have this phone for 3 months now, traveled once before to India, used an Indian SIM, never had problem until this.
I have tried:
Also tried resetting APN settings to default,
On restrating, SIM 2 APN settings come up, SIM 1 i added below manually from their website: