Because it is not using the home tower. In my zip code (CDMA market), Verizon and US Cellular are the two providers. My Tracfone should be using Verizon towers, but it is using the US Cellular towers and showing roaming on the phone in the home area. Whenever the home towers are not being used, the Tracfone will show roaming on a CDMA phone. GSM phones are a different story.
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the other day while at home I tried to make a local call with my Tracfone. It said I was roaming. I tried three time while moving within my home & it always said I was roaming. Then I tried to make a call on my wife's Tracfone and got the same message. My phone is an iPhone7, my wife's is an android. So the phone is not the problem. after about 10 min I tried again & was able to make a call. does anybody know why this happen