I miss my phone

Today is a beautiful day,but unfortunately,it is a little awful for me, because my iPhone was stolen. Thursday always busy for us, we have two class on Thursday, especially next week is our final week here. After class, I and Yaolu have decided to walked back to home. When we went to Finsbury park, the landscap is so charming so we just sat down on the ground and chatted. After a few minutes, 4 or 5 teenagers came and talked with us.We just asked some simple qusetions to each other and they showed us some cool dancing.We thought they are friendly. I took my phone and want to took a picture for their dancing.One of them asked me he wanted use my phone took a photo for us, I say yes. They are about 15 years old and looks like very innocent, but unfortunately they ran away fast, I and Yaolu just thought maybe they was kidding, when we noticed something was wrong I asked police man quikly and wanted to catched them as soon as possible,but we can not. I feel sad because I have used this phone for 2 years and it contains too many memories, and I also feel shame because I am so stupid at that time, I should pay more attention on safety. Anyway, thanks for the nice sunshine and patient police man.