Where is her cell phone?

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last night, i received a phone call from a one of my student just after i finished my lecturing on academic research and thesis writing and went back home, she told me that another student's cell phone was left on the desk in the classroom, so what i can do? i had to go back to school, that's 5 bus-stops' way from my home, you know, it's a night lecture, and the school ends at 8:30 p.m., so you know, when i was back to school, it's nearly 9:10 p.m, surprisingly, there was no cell phone on any desk, when i phoned the lost phone, it's still ringing, but i can't hear it in the classroom or anywhere nearby, has someone picked it up? no, coz no answer from the phone, has someone stolen it? no, coz it's ringing, if someone who is not willing to return the phone, they will swich off the phone. we searched everywhere, but we couldn't find it. at that time, the girl, the owner of the lost phone was back into the classroom again, she said when she was back to home, she found her phone in her bag was gone, and there are lots of important information stored in the phone, if we can't find it back, it must be a disaster for her. unfortnately, the lost phone can be phoned but still nobody answered it. therefore, the girl had to go back home to see whether someone kind would give it back to her the next day. 10:20 p/m. this morning, i got a call from the lost phone? you guess what? a call from the girl, the phone is found, the secret is...there are two layers for her bag, the first layer is broken and has got a hole in it, and the phone slips down onto the second layer of her bag, and the phone is in a buzz state, so when people phone it, we can't hear the ring...lol. the end.