A Wireless Application Protocol (WAP) is an old standard that allowed early mobile phones to access the Internet through something called a WAP Gateway. The WAP Gateway identified the device that was connecting to the Internet and could format the content sent to the device to match the screen size and type in use. It was cumbersome, failed more often than it got the screen rendered correctly and is no longer in use.
This standard was created by four companies: Ericsson, Motorola, Nokia, and Unwired Planet (now Phone.com). This protocol has become obsolete as newer Cell Phones can access the Internet no differently than your desktop or laptop computer.
Source: CNSSI 4009
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Does an SMB need to be concerned with WAP?
No. WAP is an outdated technology that was largely controlled by your mobile carrier. Today, modern carriers are running on networks known as LTE and have launched their latest network interface to the Internet – something known as 5G. 5G promises lightning quick internet on par with the fastest broadband networks available today.