i have a 3g im using now and is on firmware 2.2 and doing great however sometimes my network dissappears and i get no sim card installed or No service then I put on the airplane mode,after switching on and off the airplane mode or completly switching the fone off then on again the network may or maynot come back on.Searching takes quite a lot of time.Please is this normal or is there anyway i could stop it from giving me NO SIM CARD INSTALLED?

i mistakenly upgraded to 2.2.1 and now i dnt have wifi but that was after being downgraded to 2.1 (im using iphone 3g i need to use yellowsn0w) please i need help

Goodday yall.I mistakenly upgraded to 2.2.1(02.30.03) and i got locked out ,my yellosn0w 's not working as expected but the thing is i gave my fone to a supposedly iphone pimper,the fone came back downgraded to 2.1 but still has the baseband 023003 and also the fone HAS LOST THE WIFI it shows N/A and ICCID is blank.i currently cant use the fone at all except as an ipod!!!!please i need HELP!!!!!!!!!!!!!!!