Hi PIO. Only just joined. Didn't see it! Read through now and caught up. Wow! How fascinating. I often wondered what occured with internet access when you go to China.

Hi Paula! So glad you made it here. Hope that you and J are well.
Internet access?
The SIM card worked really well for me. I popped it into the smart phone when I landed at HK airport and it found the carrier, plus swapped over the APN without me having to do anything.
I also had ExpressVPN, which I turned on when in HK airport to make sure that the combination of the 'local' SIM and ExpressVPN worked for me in HK. It did.
When I got to Shanghai Airport, I turned everything on again. The 'local' SIM found the carrier but I had issues with connecting to ExpressVPN in Shanghai Airport. The SIM card worked well and I could send messages via WhatApp to hubby at home. The 'local' SIM card let me communicate via WhatApp with or without ExpressVPN, which was just as well.
I eventually managed to connect to the ExpressVPN servers when I was on my way to the hotel in Shanghai. I kept trying on the MagLev and eventually got connected when I was in the taxi. The ExpressVPN servers I used were located in HK. I think a couple of the other Dissers tried to connect to the servers located in Japan and they didn't manage to get any service until they swapped over to the HK servers.
Once I had connection to ExpressVPN, all normal internet access worked. I couldn't get access to FB with just the local SIM. I think the write-up on the SIM was that you should be able to access FB.....but I don't think I was ever successful at FB connection without having to turn on ExpressVPN. I was also able to access my yahoo mail using ExpressVPN. There was definitely no google and no yahoo access without the ExpressVPN.
Connection with the ExpressVPN servers were spotty. At times, it connected straightaway.....at times, it took multiple attempts before I could connect. On my smartphone (which is an iphone), I also had to go into my settings to make sure that my wifi (or was it VPN) connection was on (it did automatically switch off from time to time) if there seemed to be a delay in connection.
Once I got into the swing of things, everything worked well. I think the ExpressVPN servers did experience 'peak load' around lunchtime and periodically during the day. During those peak times, it took a bit more effort to get connected but I did get the connection after several attempts.
The local SIM card didn't work for my mother. We did google to try and work out why; and even went into an Apple reseller store in Shanghai to see if they could help. Turns out....her iphone is old and it doesn't support changing the APN at all! So, we popped her Aussie SIM card back in and used WhatApp to keep in contact with each other.
@zanzibar138 can also elaborate on her experience. I don't think she managed to get the 'local' SIM card working for her at all!
@Aussie Wendy also had a good experience with the combination she chose. I'm pretty sure she used ExpressVPN as well.
@Fairy Floss also successfully used a different combination. I'll leave it to her to share, if she wants to.
Is the currency is closed currency?
Not sure what you mean by this question....but happy to answer any question on currency.
Oh my all the scammers. Good job you were on the ball there.
That magnetic train is amazing!
Enjoying the sights of Shanghai so far. Looks like a interesting place. I love different cultures. Your hotel looks nice.
Lovely food choices. I hope you don't get ill. Looking forward to reading more.
Thank you.
I didn't get ill at all on this trip. And I didn't get ill when I arrived home either.