How does the 'barcode' top ups work with Smart PAYG?

Is the PAYG nightmare scenario real ?  Boost is switching all it’s

PAYG customers to something called PAYG smart.  The new so called smart system,

offers several disadvantages compared to the old system.  But two of these, if they are true,

are quite worrying.  Firstly, the new smart app might only be available to people who have expensive smart phones, and are tech savvy enough to understand all the high tech.  Does Boost care about it’s elderly and learning difficulty customers ?  The new smart app might not work on laptops or computers with Microsoft.  Boost customers might have to rush out and buy expensive smart phones, take out expensive contracts, and master the tech, for the luxury of sending Boost some money, just before their gas and electric is cut off. 

But don’t worry.  If customers are to be excluded online, they can still pop to the corner shop, and use paypoint.  OR, can they ?  The scare stories talk about bar codes.  Not plastic cards, but bar codes.  What does this mean ?  Surely not bar codes you can only download onto an expensive Apple or Android phone ?  If this is true it means that anybody without a high tech phone wont be able to send any money to Boost. 

Well you could switch supplier.  Unless you have a first generation smart meter, which keeps you tied to Boost.  How do you switch supplier and get a new meter during lockdown ? 

If this is true, obviously people hope to god it is not true, and Boost will clarify this.  But if it is true it means people could be unable to switch supplier, and be stuck without gas or electric for six months, unable to send Boost any money, unless they buy a smart phone, and sign up with an expensive Apple contract.