Default s4 shv e300s

goodmorning sor and mesdames i want to ask im using s4 octacore shv e300s here at ph iwant to ask what rom should be the best rom to use this is my fisrt time to use korean variant thanks kitkat version and i observe that my data connection icon is always 3g it is normal? but i observe that it fast like h+ thanks sorry for my poor englissh

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