Can a reseller contact apple fraud department and lock my phone if it has already been activated and has service

If this is a second-hand phone, and still logged into the Apple Account of a previous owner, that owner could mark the phone as Lost, turning it into a useless "brick" as far as you are concerned.

This is something that might happen if the owner did not part with the phone willingly (i.e. the phone was lost – or stolen).

Whether or not the phone is associated with someone else's Apple Account, a carrier could blacklist it, rendering it unable to receive cellular service from any carrier who honors the blacklist. This might happen if

• The phone was reported lost or stolen, or
• A previous owner bought the phone with carrier financing or subsidies, but failed to meet contract requirements

As far as the seller saying that they will contact Apple's fraud department to try to have your phone disabled, I am not sure what they are talking about. Did you give them any reason to want to do such a thing? For instance, did you pay for the phone with a check that bounced?

"Can the company I bought my Iphone from disable my device with the serial number if it’s already been activated. They say they will contact apple support with apple fraud department?"

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A Reseller Locking your Out:

Who is "they". Is there fraud you are suspicious of?

View Your Products:

If it shown under your Apple Account, and seen in Find My, then no, as it is now YOUR device: icloud.com/find. While logged into these forums, if the same Apple Account as this one you speak of, then see if it show up: https://checkcoverage.apple.com/products

Selling Used Phones:

When it comes other selling phones, this is the site the seller should have used prior to selling it to you (or whomever else). If they didn't, then take it back to them, and have them perform it: What to do Before you Sell, Give Away, or Trade in your iPhone or iPad - Apple Support

Sabsue192 wrote:

Can the company I bought my Iphone from disable my device with the serial number if it’s already been activated. They say they will contact apple support with apple fraud department?

Bottom line the answer is they can request your iPhone be disabled if you have not fulfilled your part of the contract or failed to make required payments on time. Why are they telling you they will call Apple fraud department? What made them say that? Be honest.

Who did you buy the phone from?

What reason would the reseller have to try to contact Apple? Did you do something wrong?