Does TFW affect how my iPhone works?

No, TFW does not have any negative impact on the functioning of your iPhone. It simply indicates that your cell phone runs off a TracFone-based network, which may or may not be Straight Talk or Simple Mobile. The TFW meaning simply shows your career name. As long as your data, calls, and texts are working properly, seeing "TFW carrier" is completely normal. In case of any service hitch, rather than being concerned about the label TFW, the carrier settings or the provider should be consulted.