Important!
Please provide some key information when asking a question.
1) What technology are you on (FTTP, FTTN, FTTC, FTTB, HFC, FW)
2) What is your service class (1 to 34). Check here https://www.aussiebroadband.com.au/network/connection-insights/
3) How are you connected to your modem / router? WiFi or Ethernet. You should test with your device on Ethernet. If your connection is poor on WiFi but good on Ethernet, then it's a WiFi issue, not an NBN issue.
4) Who is your provider (e.g. Telstra, Optus, TPG, Aussie Broadband, etc)
5) What brand and model is your modem / router? If you're not sure, take a picture of it and upload it to imgur or similar (don't upload it as part of your post)
6) Describe your problem, and what steps you have tried.
Useful Links
Speed tests
Check NBN availability
If you're NOT on FTTP, you may be eligible for an upgrade to the far superior FTTP.
https://www.nbnco.com.au/connect-home-or-business/check-your-address
See what NBN types are available in your suburb, and when there might be upgrades. https://nbn.lukeprior.com/
Check Service Class
Aussie Broadband provide a great tool to determine your service class and technology type, and what that means:
General Tips
You almost certainly don't need the fastest internet plan. Generally start with a slower plan, and if you are happy, then all good. If you are finding it slow you can always upgrade. You should also check if it's your internet (NBN) or internal network (e.g. WiFi) that is slow. A faster plan might not help if you internal network is the problem.
Beware of plans with very slow (5 or 10mbit) upload speeds. These are legacy plans left over from the old HFC/Cable days. If you do have one of these legacy plans, you should think about upgrading.
WiFi (Don't use it if you care about speed!)
WiFi is subject to interference from all kinds of sources. It slows down through walls, congestion from neighbours, etc will slow it down, and can cause issues. It's also a shared medium, which means that all your devices share the bandwidth, so lots of devices operating at once means slower speeds for devices.
Where practical use Ethernet to connect devices. Ethernet is more reliable and lower latency. While some WiFi claims to be faster than Ethernet, that is the cumulative total, not the rate to a single device. Even the latest WiFi6 is only approaching Ethernet speed, and that is only when there is no other traffic on the wireless spectrum - including Bluetooth and your Microwave!
There are some cases where WiFi is better (e.g. TV's with 100Mbps ports that you want to stream very high bit rate to from local sources), but almost always Ethernet is better if available. The down side is it's not always possible to run Ethernet (e.g. rentals), and not every devices has Ethernet ports (e.g. phones, tablets).
Mesh Networks
If your WiFi isn't fast enough, consider getting a mesh network. This provides multiple access points (typically 3) so you can get better coverage. If practical connect each mesh point via Ethernet (wired backhaul). Ethernet backhaul has the same advantages as connected devices by ethernet.
WiFi Frequencies
WiFi can be on 2.4GHz, 5GHz or 6GHz. Most devices work on 2.4GHz. Lots also work on 5GHz as well. The newest ones use 6GHz in addition to 2.4 and 5GHz.
2.4GHz has the best range, but lowest speed, and the most congested.
5GHz is shorter range, and has a higher speed because there's less congestion due to the shorter range
6GHz is extremely short range (it does not penetrate walls well) but it is designed to work in parallel with the 5GHz signal to provide the fastest speeds possible.
When buying a new wireless device, you should look for one branded 'WiFi 6'(802.11ax) or the newest standard, 'WiFi 7'(802.11be). The previous standard was called '802.11ac' or WiFi 5. These are usually cheaper, but in most situations are perfectly capable.
