This type of information is not likely to be readily available online due to the risk of fraud if it fell into the wrong hands. If one needs this service for a business I would suggest asking another business where to go for help.
Using a wireless service is more and more common these days, however, I am not sure what you mean by "reliable". If you are referring to online security, there are always risks involved when submitting your personal information over any connection.
Wireless internet is the most reliable type on the market. It has far fewer outages.
IVC Telecom is with reliable and affordable plans.
Wireless broadband is a very reliable service that is offered by several different providers. Verizon boasts the most reliable boradband reviews with AT&T and Sprint not far behind.
The kind of equipment needed for credit card processing will most likely include a credit terminal, which could be wireless or linked to a pinpad to capture signatures. One would also need some kind of printer to print receipts, if so desired.
That would be Verizon Wireless.
Wireless inkjet printers are reliable. It is the same as any other printer and depends on wireless router. Fail rate is no different than a wired printer.
There are quite a few wireless projector keyboards on the market today. Logitech, Dell, and iTech from Amazon are all reliable companies. Samsung also has a wireless projector available.
The Linksys WMP300N wireless adapter is very reliable. To ensure the reliability of it, they have 3 antenna's on the wireless adapter itself. It is also very safe to use.
There are many reliable brands for wireless speakers. Some of them are: Bose, Sonos, Rocketfish, Beats, Samsung, Jabra, iHome, Logitech, Jawbone, and JBL.
There are many credit card processing companies that allow you to use telephones to access their processing services. The discount rate for this is usually quite a bit higher than with an electronic transaction. Also, there are some new wireless terminal devices that may work in your environment. You may want to do a quick internet search for credit card processing and/or wireless point of sale terminals - you should get a lot of hits.
all of the above (data at rest, wireless connection, public info)