Huh?!
A "flip phone", if I am not mistaken, is a device that is not a "smart phone", and is rarely used with the data plan. The minimal net presence of such a device, coupled with a variety of software and hardware platforms, made it an unlikely hacking target, which is a "security by obscurity". There was a limited number of available apps, most frequently sold by the service provider. There was rarely, if ever, a need to upgrade such an... appliance. A software upgrade was more likely to provide a fix for broken functionality, less likely to plug a security hole.
For the record, I still use my slider phone for SMS and voice calls only. But it seems logical to me that old model of "bundling" a phone with the service forces service providers to take responsibility NOT only for their network, but for the basic maintenance of the device that they have locked/crippled when they sold it to the customer.
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