[HarryT]

Followup: my phone DOES have the reception issue, but it depends how you hold it. I'm left handed, and so hold the phone in my right hand. Doing that, there are no problems whatsoever. If you hold it in your left hand, and touch the bottom of the phone with your palm, the signal just slowly fades away to nothing. If you don't touch the bottom of the case, the problem doesn't occur.

EDIT: It's definitely touching the bottom edge of the case that's the issue. Hold it by the sides only, and it's absolutely fine.