I finally thought i should ditch the overpriced Telstra mobile service this week and join Amaysim - terrible decision in hindsight.
Definitely don't waste your time porting over to them, they're a joke.
I've posted this on their facebook page and hopefully it will save someone else from wasting their time.
"Absolutely pathetic Amaysim!
I ported my number from Telstra to you three days ago - immediately had little to no reception in Melbourne CBD.
Constant drop outs - to the point google maps doesn't even work because it can't hold an internet connect for more than 20 secs at a time.
Your hopeless customer service team can only offer no other solution than for me to pay to have a new sim sent out to me??
And apparently if i'd like to have the issue escalated I need to jump through hoops to test the sim in other phones…
What a waste of my time and money!
I look forward to porting back to Telstra immediately "
That would be the Optus network, not Amaysim specifically. And either it's the network itself, or (more likely in the CBD) your phone simply doesn't support the bands it uses. Might help to check coverage maps first, and check if your phone is compatible with those bands.