The 12-year-old appeared in a Children's Court on Monday after he was charged with offences including robbery.

Police alleged about 3pm on Saturday, the boy was in Springvale in Melbourne's south east.

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The alleged victim - a 15-year-old girl - was in the area with her 13-year-old sister when the boy asked to use her phone so he could call his mother.

The girl refused and when he persisted, she went and locked herself in a bathroom with her sister.

The court heard the boy kicked on the locked door and yelled out, "let me in n*****".

The boy eventually stopped yelling and moved away so the girls left the bathroom. They walked for some time before noticing the boy was following them.

The boy again demanded the girl hand over her phone and she kicked out at the boy's legs to stop him.

The girls hid in a nearby aquarium and the boy's friend spoke to them, asking why she kicked her friend.

After some time, they left the site and the boy allegedly ran past and grabbed the girl's phone out of her hand.

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The alleged victim found the boy's friend at the Springvale Train Station and said she would call the police unless the boy returned her mobile.

The court heard she was on the phone to officers when the boy returned the phone he allegedly stole.

Police arrived on scene a short time later and saw a group of teens matching the description in the report.

The boy fled when he saw the officers but they chased him on foot.

The court heard the boy ran onto the train tracks, disrupting train services. He was eventually arrested but was uncooperative with police.

The boy's lawyer told the Children's Court the 12-year-old was a young person who had significant issues.

The lawyer said there were support systems in place through Youth Justice that could help him while on bail.

The magistrate released the boy on bail with a condition that he must not leave the Bendigo area.

The magistrate warned the boy that if he reoffended, he could be looking at a period of youth justice detention.

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