手机没电的英文表达有以下几种：

My phone is out of battery

My phone is dead

My phone's battery is dead

My phone's battery is running low

My phone is almost out of juice

这些表达方式都能准确地传达手机电量耗尽的意思，可以根据具体情境选择合适的表达。例如，在紧急情况下，可能会说“Oh no! My phone is out of battery. I can't make any calls.”（哦不!我的手机没电了，我不能打电话了。）