smartphones(Smartphones)

I have used a smartphone which named the galaxyS2 for almost 1year+6months (for almost a year and a half or for almost 1 year and six months.)
sometimes i think smartphone is harmful for students.(Sometimes I think that the smartphone is harmful for students.) for example when i was studying i was like "hmm.. i curious whether i got messages.." zdfnlsszfs... now i miss my last phone which was not an obstacle in my studies +_+ (For example, when I was studying I would be like "hmm I am curious about whether I got a message... now I miss my lat phone which was not an obstacle in my studies.)

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The sentences in blue are my revised sentences.

smartphones

I have used a smartphone which named galaxyS2 for almost 1year+6months
sometimes i think smartphone is harmful for students. for example when i was studying i was like "hmm.. i'm curious whether i got messages.." zdfnlsszfs... now i miss my last phone which was not obstacle in my studies +_+