Mobile data not working on 6 Plus. No problems calling and texting.
So I got a second hand iPhone 6 Plus from my aunt recently and I've been having trouble getting mobile data working. She was on Telstra and had no issues with mobile data, but I'm having trouble with my Optus sim.
I have no problem making calls or texts at all, but mobile data isn't working at all. Even when I have full bars, there's no 4G or 3G available. I've made sure that mobile data is on and the APN information is correct.
I tested mobile data with a few different sims: my mum's Telstra sim worked fine, but my brother's Virgin sim had the exact same problem as my Optus sim.
Could this mean the sim is locked to Telstra? I'd always assumed a phone that's locked to a network wouldn't allow you to make calls. Any help would be appreciated, I'm going a little bit crazy.