参考答案

[A] getting into one’s residence

【解析】根据题干关键词the author believes和“exploring one’s phone contents is comparable to”可回文定位到文章第四段第三句“But exploring one’s smartphone is more like entering his or her home”，选项A语义与之一致，其中，getting into与entering对应，one’s residence与his or her home对应，故A选项为正确答案。