No. It is not possible to use 2 apple ID's simultaneously on apple iPhone 4.
This is an Apple Inc product (iPhone 4).
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Iphone
Apple
You can buy an 8GB iPhone 4 from Apple!
Apple developed the iPhone
Apple Inc.
Yes.
Apple
Apple Inc.
An iPhone 4 can be purchased at any carrier of the iPhone. And any Apple in-store or online store.