Help SMS icon disappeared

[#1]

Hi everyone,

I don't know what i have done.. but all of a sudden my messaging icon disappeared from my home page and main manu.

everytime i try sending a text to someone from my contact list i get this message

You seem to be trying to send a WhatsApp message to a phone number that is not registered with WhatsApp.

Your account mudt have WhatsApp installed in order to chat to WhatsApp.

If this was done automatically, it is likely that WhatsApp is the default messaging app.

Press "SMS" to send a normal SMS to this contact, press "invite" to send an invitation, or press "Reset" to restore default messaging app setting.

i pressed SMS but the same message keep coming up over and over again. Also, i selected Reset but nothing happens.

i've reset my phone through "Factory data reset" but i still can't find the messaging icon.

and when i enter a number and select "Send text message"

i get the same message above and when i uninstalled WhatsApp i got this message:

unfortunately, the process com.sonyericsson.android.soci alphonebook has stoped

plzz help me

* I can't recieve any text messages

[#2]

Both resets didnt solve my problem .. thnx for replying

[Uliwooly]

have you repaired it with SUS or PCC? did you rooted your phone and deleted apps?

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[#4]

i did try to repair it with SUS and it says :

The phone contains modified software that cannot be updated !

[MarlonUk1]

do you have a custom software?

[#6]

i got this message :

The phone contains modified software that cannot be updated !

[#7]

Sorry, what is a custom software

[Uliwooly]

that's the issue, you unlocked the bootloader, probably deleted some apps and that's why it's acting up. yes or no?

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[MarlonUk1]

a different software other than what you have when you first bought your phone. did you root your phone?

[Uliwooly]

he unlocked his bootloader, he probably deleted the messaging app among others that's why

he can not do a factory reset and restore this and the other apps, and that's the reason he can't use SUS or PCC

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[#11]

I got my phone as a present and i didnt root it. Do i have to reinstall the original software ? and do i have to do that through sony ericsson PC suite ?