The verdict has been in on Apple’s iPhone. Since arriving last May, the touchscreen phone with the most advanced graphics and Internet interface has dazzled buyers. And buyers have had time to get over the honeymoon feeling. Three residents of Paducah, Ky., who splurged on one of the biggest advancements ever in the cell phone industry, have had time to truly learn all the costs and benefits of their iPhones. From using the phone’s Internet access to help them on the job to learning that touch phones make plenty of unintended calls, they discovered all the ins and outs.