Read them as individual digits. Because 一 (yi1) and 七 (qi1) might get confused in less-than-ideal acoustic conditions (you're on a pay phone as the train is pulling into the station), "one" is often 幺 (yao1) to distinguish (Cf. German "zwo" for "zwei" to distinguish from "drei"), though that may be more of a mainland thing. A phone number of all eights?! *Very* lucky! :)

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-你的电话是？ -我手机号：xxx-xxx-xxxx

all numbers are said as they are except for 1 which is pronounced as yāo for example 123467890 is said as yāo-èr-sān-sì-wǔ-liù-qī-bā-jiǔ-líng

我的电话号码是XXXXXXXX wo3 de1 dian4 hua4 hao4 ma3 shi4 :XXXXXXXX