Orange and 2G and 3G

In our area Orange has been going downhill in the last year or so as to quality or reliability.

I want to change to T-Mobile and called Orange to transfer my number and they started the usual about valued customer, special deal ...

She then mentioned that the older phones used 2G which now were being run down (hence the wose quality) while a new phone of my choice would use 3G and be much better.

Does this make any sense and is it true?

My existing phone is an SE K750i and the replacement a K800i.
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Les Desser
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