Most modern apps (banking, social media, navigation) now require at least iOS 15 or higher to function.
While you can technically find an iPhone 5s for Cricket Wireless on eBay or other third-party marketplaces, . The device lacks critical modern hardware support, which will result in limited or non-existent service on the Cricket network. Network Compatibility Issues buy cricket iphone 5s
Cricket (and its parent network AT&T) now requires VoLTE (Voice over LTE) for all calls. The iPhone 5s does not support this technology, meaning you cannot make or receive standard phone calls even if you have a signal. Most modern apps (banking, social media, navigation) now