Would restoring my iphone to another iphones settings change the imei?

Basically i bought a phone from cex about 2 weeks ago and one of the buttons has stopped working. I went into the store and they said they could not fix it because the imei's were not the same.
Could i have changed it by restoring it to my old iphone's setting via the restore feature on itunes?

No. IMEI is physically built in to every phone to uniquely identify it. There's no way you can accidentally change it.

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