Hey there, were you ever able to get through to T-Mobile customer care? Do you remember if you have insurance on the phone? It would be either with Asurion or (more likely) Assurant. The direct number for Assurant is 866-866-6285.
Hey there, and sorry about your lost phone.
I do hope you were able to get in touch with our Care team. Please let us know if you were able to touch base with us about your missing device. As mentioned above, you should definitely reach out to Asurion or Assurant to file a claim if you have insurance.
Just checking in here to see if you still needed help with this.