You used to be able to do this on a non-jailbroken iPhone, but that’s no longer possible on the latest versions of iOS. On a jailbroken iPhone, you can use a free jailbreak tweak called SignaldBm to put that information directly in the Status Bar. Whenever you’re curious about your iPhone’s cellular signal strength, you probably just glance at the Status Bar and see how many bars you have, with zero being no signal at all and four being a strong signal.īut if you’re looking for more advanced cellular signal strength readouts, then you might want to look for your dBm reading, which stands for decibels per milliwatt. Seeing your numeric signal strength in dBm In this tutorial, we’ll show you how to enter Field Test mode on your iPhone and view the dBm (decibels per milliwatt) value rather than just the basic signal bar indicators. When you have an iPhone, your carrier’s signal strength can be one of the most important things that helps you decide which carrier to go with.
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