A man who had sex with a minor and committed cheating and criminal breach of trust offences was jailed for 17 months on Thursday.

Leonard Quek Wei Yong, 24, who faced a total of 29 charges, had pleaded guilty to 10 charges.

A district court heard that he was 20 years old when he met the girl, a student, while travelling in the sky train from Sentosa to VivoCity in May 2009.

After getting her mobile, they sent text messages to each other.

On May 18 that year, he invited her to "chill'' at a hotel in Sims Avenue and ended up having sex with her. He had sex two more times with her on May 20 and 23.

Deputy Public Prosecutor Haniza Abnass said besides sex, Quek also often demanded money from the victim who resorted to borrowing from friends and even considered working part-time.

She lent him an estimated $1,600, most of which had not been returned.

When she once asked him to return the money, he warned her "to be careful when she goes out''. He also took three mobile phones, an MP3 player and a PSP handheld game console from her.

The matter came to light when the victim's father noticed numerous withdrawals from her POSB account. The victim admitted that she had lent Quek money and had sex with him.

In the other cases, Ms Haniza said Quek befriended female victims and subsequently persuaded them to subscribe to mobile phone plans on the pretext of getting the cellphones for work purposes.

After the victims handed over the new mobile phones to him, they would receive bills for amounts chalked up which he had not paid.

He also used various deceptions to convince the victims to give him branded goods or to part with their belongings. The total amount involved in the cheating and criminal breach of trust charges is about $19,000.