Some devices after full official unlock iPhone Sprint USA by IMEI can not be activated via Itunes for the reason that they ask ZIP code (Billing ZIP Postal + Last 4 digits of Social Security Number).
ATTENTION! VERY IMPORTANT:
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Before ordering this service yuor phone must be unlocked.
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If you order not unlocked IMEI, cancelation is IMPOSSIBLE! You lose money for such an order!
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Check the UNLOCK status before ordering!
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Before ordering necessarily need to order check by IMEI.
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Before ordering services necessarily need to upgrade your phone to the latest version of iOS!
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In the comment field when ordering, be sure to add links to:
- screenshot with phone display along with IMEI number
- screenshot with the phone's display along with the phone number (upload images to the file-uploader: postimages.org)

Also, this service helps to activate unlocked phones from Sprint with the following problem:
Apparently, the SIM card inserted into this iPhone is not supported.
This service is intended for the forced activation of such phones.