if you want a "true" UPC code, you need to go through GS1.
Simply Barcodes get their numbers from GS1, so I guess they just bulk buy UPCs from GS1 and resell.
from their FAQ:
the $1.29 ones seems to be only generating UPC format barcode, but not assigning a ture UPC unique number, you cna print a UPC format barcode for free! but it's useless.
I would ask Simply Barcode if you can register with GS1 later if needed but I'm sur eyou can since they get their numbers form GS1 themselves... this would allows you to keep the same UPC forever.
Simply Barcodes get their numbers from GS1, so I guess they just bulk buy UPCs from GS1 and resell.
from their FAQ:
All of our codes originate with the governing body, GS1 and never previously used.
the $1.29 ones seems to be only generating UPC format barcode, but not assigning a ture UPC unique number, you cna print a UPC format barcode for free! but it's useless.
I would ask Simply Barcode if you can register with GS1 later if needed but I'm sur eyou can since they get their numbers form GS1 themselves... this would allows you to keep the same UPC forever.