TFW is not a fault message. In case you might ask what TFW means in the iPhone, it signifies that your cell phone is enrolled in the services of TracFone Wireless. This is a common name that can be seen attached to your gadget when it is linked to TracFone or its brands. Therefore, the symbol TFW is not there to warn that something is wrong, but it implies that it is your network provider. When the TFW appears, you are still able to make phone calls, text, or use the net.
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