UK GDPR: The UK General Data Protection Regulation governing how personal data must be handled, processed and protected in relation to SIM card usage and monitoring

Data Protection Act 2018: UK's implementation of data protection law that works alongside UK GDPR to regulate personal data processing and protection

Privacy and Electronic Communications Regulations 2003: Specific regulations governing privacy rights in relation to electronic communications including mobile telecommunications

Communications Act 2003: Primary legislation governing telecommunications services and regulatory framework in the UK

Telecommunications Act 1984: Historical telecommunications legislation with some provisions still relevant to current telecommunications services

Electronic Communications Code: Code regulating the rights of telecommunications operators and their relationship with land owners/occupiers

Employment Rights Act 1996: Legislation governing employment rights relevant when providing company SIM cards to employees

Equality Act 2010: Legislation ensuring non-discriminatory practices in the provision and authorization of company resources

Common Law Contract Principles: Fundamental principles of contract formation and enforcement under English common law

Consumer Rights Act 2015: Legislation protecting consumer rights, potentially relevant if the SIM contract involves consumer-facing elements

Companies Act 2006: Primary legislation governing company operations, particularly relevant for authority to sign company documents

Ofcom Regulations: Regulatory requirements and guidelines set by the UK's communications regulator for mobile services