I purchased a nokia lumia 521 from amazon. It is a go phone..I went online and acivated the sim card and got a phone number. I selected the $25 a month plan but did not add any money as I was going to wait until I needed the phone...Started a new job 2 months later so I go to add money so I can use the phone and now it is telling me I have an invalid sim. Was hoping there was a simple solution so figured I'd post first lol..any help would be appreciated..thanks
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