Does unlock code from ee only work once as put another network sim in phone and is still locked
No, once unlocked it's done for life. You have either entered the code incorrectly , or you have the wrong code. That is if you need one as say iPhones are unlocked by Apple.
Hi @Seandykes83 and welcome to the community.
Once an unlock code has been entered successfully the device will be permanently unlocked.
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