Just received this text and confirmed via 3 customer support

[Antaire]

We wanted to let you know about upcoming changes to our network. From 19 April, download speeds will be capped at 50Mbps for new customers. 

What happens if you ordered a SIM card for a family member on the 18th ?

This should be stated when ordering surely.

[Ausername]

 I has tested it in a area where I can reach 2GB made it too now 45MB

next time I pay is the Last time i would pay the last time to Three

[Paddiewack]

Firstly there’s no way your previous download speed would attain 2gb and secondly if you’re on a contract then not paying could harm your credit score. 

[Ausername]

 i has two sim how would i be on contract then

i don't have a credit  card i top up in store not online 

[Paddiewack]

So if you top up you’re obviously a pay as you go customer as opposed to being on contract. 

[Ausername]

That tell customers we turning back on Our 3G Tower

[Paddiewack]

From Chat gpt as of now!