I'd probably search the Whirlpool forums for similar threads. If they have no guarantee on quality of service, then shitty service is probably enough.

I use Aldi because Telstra, thanks to their dominance is the only one that works well enough. The phone also plays a big part in it, I run Graphene on the 'a' models (plus other cheaper phones prior), and other people I work with can get better reception than I, using the same provider but with their flagship phones. Next time you buy a phone, see if you can review the modem in it.

And to top that off, I get no reception at all where I live. Besides the fucking annoyance of getting 'text message' verifications which drive me up the wall, not having the phone working gets quite relaxing after a while. I turned off wi-fi calling when my phone finally had it because the shock of it ringing was too much.