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Mobile phone detects the original phone number of that simcard.

25 Mar
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I had trouble with my Samsung Galaxy S4 detecting the original phone number from the sim card before I transferred to the Three network.
This was due to me leaving my original network O2 and when I took out a new contract with Three network they gave me a new sim card with a different phone number on.
I then supplied the PUK code and transferred my original phone number from O2 over to Three.
Now the phone number would fully work as planned and as normal apart from one minor issue.
That issue was that the Samsung Galaxy S4 detects the original phone number that was on the Three network SIM card before I transferred it over.
So apps that use your phone number such as Whatsapp read the phone number from the SIM which I would assume is stored in the SIM although my new phone number works for ingoing and out going calls.
So normally you have to go into Whatsapp and all the other apps that use the phone number stored in the SIM and change them. Not a big deal but when you factory reset you have to re enter it all. Such a pain in the bum.

Basically the answer is this:

Contact your network provider e.g. Three Network and state you need a replacement SIM. Make sure the replacement SIM comes programmed with the phone number you wish to use.
They send you the SIM you then can either activate it online or call them and within 2 hours your new SIM will fully work and the phone number for the apps will be correct and in your phones device settings.

Activate your SIM here:

http://www.three.co.uk/Support/SIM_activation

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