Nano SIM card for new device

[Cestrian]

I am getting a new phone, a Samsung A20e which takes a nano SIM card. My existing phone a Samsung J3 2016 has a standard SIM card. How do I get a nano card? I tried ringing 4445 but the signal here is so poor I need to speak to a physical person. The chat line appears closed.

I assume that being a PYG (the traditional type not the pay monthly option) customer I cannot have a booster without paying a fortune.  I als believe I cannot have wifi messaging because I don't have a monthly contract. Are both statements correct?

[MI5 · Accepted solution]

@Cestrian 

Both statements are correct and unless you can push the middle out of your sim, you'll need to try some way of calling Guide: Coronavirus Community Help and Support 

The best number to get through seems to be
0800 587 4005

[Cestrian]

Thanks for your help. How easy is to pop out the nano card? Is there a risk of damaging it?

[MI5]

@Cestrian 

It's real easy if your sim has the perforations in it already.