IMEI Number When Phone Not Working

[JWL]

My Xperia XA1 has suffered from the whole not turning on situation. Nothing has sorted it (all avenues have been exhausted!). I wanted to send my phone in for repair, however I can't do this without the IMEI number, and I can't get this off my phone. Are there any other ways I can get the number?

[CapedChameleon]

If you open the sim tray on the side there is a small piece of plastic with the IMEI number prnted on it which should slide out if you tip the phone on its side.