Does iPhone 4 take time for 3g to activate after you buy it?

Yes, the iphone 4 can take some time to activate 3G service after purchase. This activation process typically includes setting up the device with your SIM card and carrier plan, which can vary in duration based on network conditions and carrier policies. Once activated, 3G service should be available shortly thereafter. If issues persist, restarting the device or contacting your carrier may help expedite the process.