Following the iPhone 3GS day of June 19, Apple servers are struggling to cope with the demand for activation of the newly released iPhone. The issue recalls similar problems Apple had with the release of the iPhone 3G last year.

“Your activation requires additional time to complete,” reads a message from iTunes for some iPhone 3G S customers. “Due to the current volumes, it may take up to 48 hours to resolve your issue.”

Apple has not responded to press inquiries regarding the delays, and it’s unclear how many customers this is affecting.

[via Information Week]