I haven't used a phone service for years and have no need for it. I do notice that OPTUS charges the same ($80/mo under 24month contract) if you buy their broadband-only service or buy it in a bundle with an unlimited phone service.
I mention optus because I am an optus post-paid phone user, get 20% off if I choose Optus broadband, effectively $64/mo under 24mo contract.
So are there better services competing by not offering a phone service? My area has both NBN and ADSL.
P.S. It seems all ISP supply their router. I am happy with Modem only since most routers are not very good at wifi and that I want to use 5GHz which isn't often offered by ISP default routers. I guess allow Bring-your-own device is a competition disadvantage right? (Since support becomes more expensive.)
if you are technologically clueless, then yes, you should probably get a ISP supplied router and get all the on-the-phone support for that particular device.
However there are no disadvantages or advantages to signing up to an ISP that supplies a router. They are often off the shelf units that you can buy from a computer shop — though noted that Optus does supply a Sagecom router which does appear to be a steaming pile of poo (according to WP).
If it's an off the shelf unit, they can be sold to finance a better router or used as a Wifi repeater or extender to boost your wifi network.
As for phone service, some providers do offer VOIP as part of the package. If you have no need for landline, then pay no heed to it and just concentrate on getting the best value unlimited plans at the best possible speed for the lowest price. The "My Basics" plan for you would cost 64 a month but that's for Tier 1 speed (12/1) which is really, really slow for fibre.
I'd consider getting the Tier 2 Speed for +10 a month, which brings it to $72 a month.
For your reference I'm paying $67 dollars a month for
Provider: Devoted NBN (Acquired by Nuskope)
Unlimited NBN (Fiber to the Home)
Tier 2 NBN speeds (25/5)
No phone or VOIP service
BYO Modem or Router
18 month lock-in
$80 connection fee paid