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What parts are the same between the two models internally and what are different? When I am repairing someones phone what parts can be interchanged between the two and which can not? Is the LCD/Digitizer the same? Does the back have the same brackets?

there are 2 types of iPhones. iphone4 CDMA looks like iphone4s from inside and outside but this does not support sim card. there is no space where you can put the sim card. iphone4s are also again 2 types. 1 is GSM phone and other is CDMA+ GSM. other one also known as world’s phone. you can use both GSM sim and CDMA service in this phone. the parts are almost same as all in these 3 phones. all are same just difference in logic board. you can use any part from these for interchanging to checking the working condition.

There are 3 types of iPhone 4S manufacture configs. GU_US, GSM/UMTS USA/Asia variant GUC_US, GSM/UMTS/CDMA variant They are completely identical in hardware, but the GUC ones are provisioned with CDMA baseband data, that’s the only way to use CDMA. The third one is GU_EU, most parts are identical, with slightly different top antenna to pass European RF regulations

LCD/Digitizer are identical and so are all of the other parts. The only exception, of course, is the logic board.

What about the Bezel. It is not the same but are the screws for the lcd/digitizer in the same spots. Do you have to keep a stock of CDMA and GSM? Are they different. I know the battery, vibrator, cameras, loudspeaker module, charging port, home button and home button flex, are the same.

CDMA- No sim card support, Can only use it on a carrier. GSM- Sim card support, Can use it with other sims.

Look I have a Verizon phone with a sim tray so is it the same as others iv seen Verizon’s phones with no tray those most be the older ones right

I don’t have an answer but I am working on iphone 4 and recently bought some logic boards but they are longer than the one I am replacing. So whatz up with that? Anyone

The LCDs are the same size but the frames are different. if u can change this frame, u are good to go