Huh? Getting the SIM with the phone mattered twenty years ago when people were buying their first mobile phone. But everyone has a phone now. The SIM is a removable component. You buy a new phone, you take the SIM out of the old phone (and then sell, recycle, or scrap it) and put it in the new phone.
I actually doubt your "over 90%" figure anyway, and I'd like to see where you got it from. A lot of the world's subscribers aren't using an operator that even has such stores, it's cheap to set up a "virtual" operator which has no substantial physical presence, just a unique identifier and a website to sell SIMs. Maybe you put up a Polish site and you sell into the UK. You pay the UK operators for coverage, you bulk-buy capacity to Poland and your subscribers get a fixed rate deal to call home, plus customer service in their first language. No overhead for storefronts, no engineering effort to pointlessly "rebrand" things people don't want branded in the first place, just a nice service for a healthy profit. Add those up worldwide and it's hard to see where your 90% fits. FWIW I have _never_ heard anyone who uses such a service lamenting the difficulty of buying a handset, it just isn't an issue.
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