AnitaMo95 Said:
"How does a thief remove my device from my icloud? My phone was stolen and for the first few days it appeared in icloud, after a while it says no devices when I log into icloud."
-------
I. What Someone:
Use the "Deauthorize All" Option:
They used the Deauthorize All option Yin your Apple ID. Note that you can only Deauthorize All items once every 365 days. So, you may have to wait up to a year before you can get these back into your account. See Here: Authorize or Deauthorize your Computer for iTunes Store purchases - Apple Support
II. What you Should Consider doing:
A. Modify your Credentials:
Having so much suspicion, consider modifying your credentials, ASAP, starting with a new password.
And...
B. Verify the Devices:
Verify that the devices assigned to your iCloud are your devices: Check your Apple ID Device List to See where you're Signed in - Apple Support