Carriers are getting ready as Apple Inc. has made the call for its Let's Talk iPhone event Tuesday, when consumers expect the company to showcase its highly anticipated iPhone5.

Amid this anticipation of the fifth-generation iPhone release, it has been rumored that AT&T Inc. has denied vacation time to its employees this month. Also, they will be asked to work overtime throughout it.

There also have been reports of an internal memo from Sprint Nextel Corp. management indicating the company has informed its employees they cannot go on vacation from Sept. 30 to Oct. 15 due to a possible major mobile phone launch. This appears to be the case in spite of the fact Apple has not yet confirmed that a Sprint iPhone5 is going to happen. Meanwhile, there are indications that even though Sprint management has not directly discussed the iPhone5, the expected new product seems to be a part of the future business of the company.

Above all these, there is a rumor that RadioShack Corp. inventory documentation has Apple's next-generation smartphone listed not only for AT&T and Sprint but also for Verizon Communications Inc. The Verizon iPhone5 expectations intensified when Verizon offered the $120 iPhone4 to select customers until the end of last month.

Meanwhile, Apple's iPhone5 remains the most anticipated smartphone in the U.S. marketplace, and has broken all kinds of records when it comes to rumors surrounding a device. More will be known at the Apple event on Tuesday, when there should be available full details of the presumed new product and, possibly, iOS5 and iCloud.