question about slumdog millionaire?

I guess she didn't have a phone. She was owned by Maman, I don't think he would let her keep any money. And she was just rescued, she probably didn't have time to ask Jamal his number ( or maybe Jamal didn't have a phone, either). When Jamal found his brother when they grew up, Salim said they were chased by Maman's guys and he left a message (could mean an oral message through waitor) to him. However, Jamal didn't received it. Maybe he was telling the truth. He had to join Javed. And Javed liked Latika. In order to survive, Latika had to be his girlfriend. Then, she can't reach him.