Apple Inc. applied for a radio wave certificate at a South Korean national agency for its new iPhone 4S on Wednesday, signaling an imminent domestic launch of its latest smartphone. An official at the National Radio Search Agency, which oversees and certifies the radio wave compatibility of imported electronics products, confirmed that Apple submitted the newly minted iPhone 4S to the agency to have it certified before it officially goes on sale. The certification process usually takes one week, which will make the iPhone 4S ready to go on sale as early as November in South Korea.