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You have to contact your service provider (carrier) &nbsp;to do that, AT&amp;T. It may cost a fee if the other phone is not purchased through them and they will need to put a sim chip in the phone so that the phone can be used on their network.
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GMartin

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Thank you, everyone, for taking the time to address my question. &nbsp; I especially appreciate the feedback given by Andrew which certainly demystifies the process involved in changing out the SIMM card in addition to its role as a storage device. &nbsp;Seeing that we will be changing the phones and not the carrier, it makes sense this transition should go smoothly and without the need for professional intervention. <br />
<br />
On a side note, I have recently opened up a new question which can be located at <a href="https://www.experts-exchange.com/questions/29132998/can-the-charging-port-of-an-iPhone-5-and-iPhone-6-be-used-as-a-data-port.html#questionAdd" rel="ugc">https://www.experts-exchange.com/questions/29132998/can-the-charging-port-of-an-iPhone-5-and-iPhone-6-be-used-as-a-data-port.html#questionAdd</a>&nbsp;that I feel confident can be answered. &nbsp;<br />
<br />
Thanks again.<br />
<br />
George
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Pleasure George, glad I was able to help out. I've also put a comment in your other question which I hope answers your queries there :)<br />
<br />
Regards, Andrew
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Hello and Good Morning Everyone,<br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;My fiancee is getting ready to upgrade from an iPhone 5 to an iPhone 6 which brings me to the point of this upcoming question. &nbsp; How can she keep her old telephone number on the iPhone 5 when she upgrades to the iPhone 6? &nbsp;In other words, can she possibly transfer her old telephone number to the new iPhone 6? &nbsp;Her carrier is AT&amp;T. <br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Thank you<br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;George
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Hello and Good Morning Everyone,

           My fiancee is getting ready to upgrade from an iPhone 5 to an iPhone 6 which brings me to the point of this upcoming question.   How can she keep her old telephone number on the iPhone 5 when she upgrades to the iPhone 6?  In other words, can she possibly transfer her old telephone number to the new iPhone 6?  Her carrier is AT&T. 

           Thank you

           George

how can an old telephone number on an iPhone 5 be kept or transferred onto an iPhone 6?

The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.

iPhone

A miscellany is defined as a "collection of various pieces of writing by different authors", but it has come to mean something "Of items gathered or considered together of various types or from different sources" or "a collection or group composed of members or elements of different kinds". The word "miscellaneous" comes from the Latin word "miscere", meaning "to mix." You might have heard the expression "a mixed bag," which applies when you don't quite know what you're going to get. More commonly, a miscellaneous group is made up of an odd group of things that don't fit anywhere else.