Upgraded my iPhone 4S to 5.1.1 and can't find network. HELP!

Upgraded my iPhone 4S to 5.1.1 and will not find our network! Says searching ever since I updated it.

OK. Sprint is a CDMA carrier and your 4S is both a GSM and CDMA phone. In the US on the Sprint network is uses the CDMA "portion" of the phone  The SIM is needed to access GSM networks abroad (most of the world, save a few exceptions uses GSM).  You will need the Sprint GSM SIM in order for the phone to roam in the Bahamas. Contact Sprint in order to get a replacement if you cannot find yours.
Your other option is to have Sprint, SIM unlock your phone. That way you will be able to buy a prepaid/pay as you go SIM in the Bahamas, if available.
Not sure why the Genuis took it out the SIM in the first place. It would not affect your service if it was left in.

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