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You can try using the display SIM card name function, it will display the SIM card name on the title.
The SIM card name can be configured in the settings.
[SIM1(EE) Receive SMS]
From: UK_Gov
Content: GOV.UK CORONAVIRUS ALERT New rules in force now: you must stay at home. More info & Exemptions at gov.uk/coronavirus Stay at home. Protect the NHS. Save lives.