Your iPhone uses an assortment of cellular and Wi-Fi-based networks to keep you connected to the internet throughout the day, but as you might come to expect, your iPhone uses more battery and data when it stays connected to both.
WiCellSwitcher is a new free jailbreak tweak by iOS developer Bruno Andrade that automatically disables your iPhone’s cellular radio whenever you connect to a Wi-Fi network, and as you might come to expect, it automatically turns the cellular radio back on again after your handset drops its Wi-Fi connection.