Apple's iPhone 5S devices are now being advertised as available to ship within 24 hours through the smartphone maker's online store.

The deal applies for iPhone 5S devices in 16, 32, and 64-gig options, compatible for AT&T, Sprint, and Verizon.

Those who are looking to buy the smartphone through T-Mobile will have to wait up to three business days for the phone to be sent out, according to Apple.

SIM card-free unlocked devices are being advertised with a wait time of three to five business days.

Improved shipping times for the iPhone 5S came at the same time Apple announced it had reached "full availability" of iPhone 5S devices at retail stores.

As of last week, all models were in stock at all Apple Store locations, according to U.S. Analyst Gene Munster of Piper Jaffray.

Approximately 60 stores were surveyed, according to CNET.com.

iPhone 5S devices were previous sold with a three day delivery guarantee. Apple has greatly improved the availability of its newest smartphone since first releasing it back in September.

The improved availability is also good news for holiday shoppers as there is just a little over two weeks before Christmas.

Shipping estimates reached two to three weeks on November 19 for the iPhone 5S due to production issues.

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