I lost my phone about a year ago, and was sent out a replacement from the Geek Squad (insurance).
A couple of days after, I went into work and they said a customer handed it in. The IMEI wasn't blocked, so I decided to keep the phone for TomTom, and an iphone sim for the free internet. This has now expired.
Question is, should I risk using my original sim card in it for the unlimited internet, or are they likely to block the imei?