Sorry to hear this, happened to me when my phone slipped out of my bag down the back of the seat. I realised before we even got to baggage reclaim but they wont let you back on. Said it would be handed in and to check next day. As we left the plane the cleaners were piling on. I never got it back, and at the time was on pay as you go. Several calls to SENEGAL later and my cash had disappeared. I was with Orange and they basically accused me of lying and of making the calls myself. It was appalling and only after weeks of 'communication', repeating everything every single time, we managed to find a higher person at Orange. There was no real apology but it was so distressing, I changed to EE.