O2

Hi All,I've just completed the sim swap to my new phone (Xperia Z3 compact to Xperia 10 lll).I'm trying to use what's app in my new phone, but the "initialising" is taking some time, resulting in it telling me "unable to connect. Please try again lat...

I have my new Sony Xperia 10 lll. I've transferred most of my data over and almost completed personalizing it. I'm still using my old phone until the new one is "perfect". I've inserted the new SIM card sent with the phone. My question is: do I need ...