Saudi Arabia has announced that spying on your partner’s mobile phone is a criminal offence as part of a wide-ranging new law designed to tackle cybercrime.

“Married individuals planning to spy on their spouse in Saudi Arabia will need to think twice, because such an activity could potentially attract a fine of 500,000 riyals (£95,000) along with a prison term for a year,” an English-language statement released this week by the Saudi Centre for International Communications said.

The conservative Kingdom, where almost 70 per cent of the population is under 30 years of age, is among the world’s top per capita users of mobile phone apps and social media.

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The new law is designed to protect citizens from blackmail, embezzlement and defamation, as well as to “protect morals of individuals and society and protect privacy”, the statement said.

Human rights groups have constantly criticised Saudi Arabia’s record on freedom of speech and expression. A 2014 anti-dissent law made any act that “undermines” the state a potential act of terrorism, including calls for regime change made on social media.

The law also granted the security services sweeping powers to track phone calls and internet usage.

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Last year, the government called on normal Saudis to begin reporting suspicious social media activity to the authorities.

Saudi Arabia’s King Salman, at the behest of his son, Crown Prince Mohammed bin Salman, has issued a raft of royal decrees in recent months designed to liberalise some of the Islamic kingdom’s conservative laws.

The most high-profile announcements include allowing women to drive from June, and curbing the powers of Saudi Arabia’s notorious religious police.