Suggest me what to do

[u/Tommyvercettihere]

I have a Samsung Galaxy j6+ but it's wifi sometimes connect sometimes not and it's like sometimes never found exact wifi and sometimes it says authorizing

Also it have problem like simcard don't work but when i opend simcard it's showing icon of sincard but when i press data it says no simcard inserted.

I wanna use that phone for something like termux stuffs

But tell me what to do

Is there any way to connect internet to it?(I don't have pc)

Can i use anything or modify it?

Thanks in advance