Correct

销号

/ xiāo háo / 
Strokes

Example

As a Verb

(of telephone service, registration, etc) cancel a number

1
Shǒujī
手机
xiāoháo
销号

cancel a cell phone number

2
Diànhuà
电话
xiāoháo
销号

disannul a call

3
Xiāoháo
销号
fèi
费

cancellation fee