D500 Problem

i got a samsung d500 off a mate and when i turn it on it says limited service and i can't call or text what do i do to fix this?

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theres a function on it called flight mode is that turned off

wer cud i find dat i don't think i hav come across it before

its normally under settings, or near where you phone has the option to go on silent

i found a FDN mode on ma fone and it is disabled is dat the flight mode, should i leave it off of should i switch it on.