[Q] HELP......reactivating flashed s3 to straight talk

[mjdodson05]

I have a sprint galaxy s3....I had it flashed to use on straight talk service. I used it one month and my service expired and now I cannot reactivate my phone with a new straight talk number. I tried contacting the man I payed to flash it, to help me reactivate the phone, but he will not return my messages.