CarrierEditor allows you to customize your iOS device's carrier logo to something totally different. This is limited to devices that can support data/phone service, so no WiFi-only devices. Some carriers might not be supported because they do not use images for their logos (e.g. Sprint). The good part is that CarrierEditor works WITHOUT a jailbreak on any firmware, so iPhone 5's and iPad LTE's work. If you do not see your device/carrier within CarrierEditor in the drop down lists, it means that your device is incompatible.