User Activity

How to download my o2 app overseas (africa)? My google play store says "it is not available in my country" Is there a way to download it?
I need to track my simcard delivery as it has been over 6 days. All i got was a noreply email saying thanks for ordering the sim! Is there a tracking number? Or a contact information to o2? I am from Jersey Island btw
How to enable roaming or is it automatically done once i land in EU? (O2 pay as you go 15£ package)
Which pay as you go no contract package should i buy that will be good for a two week greece and malta trip? How to enable roaming or is it automatically done once i land? What is my roaming allowance
Under filling this form: https://www.o2.co.uk/help/device-and-sim-support/how-to-keep-your-mobile-number/online-form Are "number to be transferred" and "number to change" the same thing?