My phone I bought from everbuying.com won't read

I assume that you are talking about the samsung galaxy note 3 which use a micro-sim and support 2g, 3g and 4g network: if you are getting 'no service' it means that your note 3 cannot 'register' itself to the AT&T provider: try using this specific sim with another mobile from the same location and if it works then it is most likely a configuration issue with the note 3 (e.g. you must select the correct 2g or 3g or 4g network to connect).
If your sim does not work with another mobile phone, then the SIM is probably not activated and will not register/will have no service: call AT&T help desk to get the SIM/number activated.
ps. you can always take your Note 3 to an AT&T dealer and ask them to help you set your device for free (but ask first!).
Hope it helps.

switch off your blackberry, remove the back cover and battery, and remove the sim card. Replace it after about one minute and it should not read SOS anymore.
If it still reads SOS, insert your sim card into another cellphone to see if it also reads SOS in a different phone. If it does, you need to call the company you bought the sim card from.
Eg; if it's an MTN sim card, call MTN; if it's Vodacom, call Vodacom etc.

Perhaps the sim card was not initialized. Initialization allows you to communicate.

your sim card may be corrupted check the sam sim in another mobile if it works on that mobile then your sim read ic may be corrupted so please contact your nearest sevice professional

you can check it with other sim card ,if it remains the same problem ,it may be locked to particular network wont accept any sim card other than the particular network ,you can unlock it and used to other network,try here http://www.theunlockarena.com/nokia-e5/rs13wp9/

I bought a new samsung t239,anytime I insert a sim card it reads wrong sim card.

• PUK means "personal unlocking key" .
  The PUK code is asked if you enter a wrong pin 3 times.
  You need to call your phone service company, they can retrieve the puk code from a database
  for free.
  In your case you need to contact your SIM card phone provider technical support to unlock the SIM.
  The PIN and PUK are related to the SIM card, not to the phone.
  If you replace the SIM card with a different one, then the phone should not ask for the PUK anymore.
  Your rating is highly appreciated on this matter.

my i776 boostmobile won't get service even with a new sim what can i do?

You have to unlock it by visiting www.unlock-free.com/lg

I think there's some problem in your sim card.To confirm it just fit your sim in another mobile & see if it's working.