I lost my phone
I don't see my other device on find my, I have 2 phones with one account
iPhone 5s, iOS 12
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Did you respond to a text to get your phone back that asked you to sign in? See “mitigation” below
Please first look at this - If your iPhone, iPad or iPod touch is lost or stolen – Apple Support
Tracking lost or stolen phones
The 'Find My' tracking is to help you discover if you left your phone in the office or the restaurant. Lost or Stolen phones are rarely ever seen again.
Risk mitigation
Get your provider to
Cancel your SIM.
Send you a replacement SIM on same number.
You can then put the SIM in another phone to get the codes you will need.
Phishing warning
Unless you had a PIN set on the SIM the thief or finder now know your number so don’t respond to texts to sign into your account!
Resign to the fact your data is safe but you will never see the phone again