this is unregister number could not switch啥意思?切换手机卡的时候出的提示.

this is unregister number could not switch啥意思?切换手机卡的时候出的提示. 苹果手机打电话,总是提示一串英文“This is unregister number,could not switch” What is this?It is ----------N This is a n开头的jacket, this is a event of this product s/n What's this?This is _____N.A.a B.an C./ 选择哪一个?为什么? This is is this This is THIS IS this is this is pi()n() this is a pi()n() in my room 大家帮想一想这个单词 第二个字母是n,一共七个字母的单词适合这句话：This is my （ ）This is my ( ) what is this ?It is a pen而不是It is pen.但为什么what's this? It's N.就是正确的?N前不能有冠词吗? this S/N is not available.Please check if it is the right one.中文是什么 This Is What Rock N Roll Looks Like歌词求porcelain black的This Is What Rock N Roll Looks Like的中、英文歌词. This book is too__________,I want to read a(n)_________one.(boring)