Can i turn off 4g and go back to 3g?

i upgraded and shouldn't have. battery life *****. i want to go back to 3g. can i downgrade back to 3g or turn off the 4g for 3g somehow? i don't see how to? or could i uninstall ios5 for the previous version? i have a 4s.

Long Term Evolution, which is 4G and currently used by Verizon and AT&T and will later be used by Sprint and T-Mobile. While the version currently being introduced did not meet original drafts of 4G standards (which originally called for 100mbps download speeds) the standards were modified and LTE (and as an offshoot, HSPA+) qualified as 4G.
The iPhone 4s is not compatible with LTE but the new iPad has models that are LTE compatible.

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