Fix problems with SMS sending problem in Korean version of S2

The code *#*#4636#*#* is not working?

My ST S2 Korean is giving an error on SMS and only send MMS

1. 1
   Take out the battery and SIM card and wait 5 minutes before inserting these back and turning the phone on

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2. 2
   Go to Settings then WiFi and toggle the WiFi to off

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   You may have to toggle to on then off it was not enabled before.

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3. 3
   In Settings again, go to Network and make sure it is set up properly

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   Toggle on and off again if you are not sure of the settings. It will refresh and update properly if there is no software issue. If there is an issue, then you will have to hard reset your device.

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4. 4
   Go to Message Settings and toggle between on and off then on again for delivery.

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5. 5
   Your phone should now show messages you have missed and be working again.

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My let/WCDMA/GSM auto is very slowly I don't know what to do?

I have problem with network p. It is very slow I don't know the reason I'd like to know what I should do? It shows E

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