Upvote:1
You donβt need to turn off iMessage. It is transmitted over data and has no connection to SMS and your carrier.
The simple answer is no. iMessage messages are not sent via your wireless provider, whether it be Verizon, AT&T, Orange or any other provider. These messages are managed and delivered by Apple, and as such have no impact on your text (SMS) or multimedia (MMS) messaging plans through your provider.
I would recommend turning it off though. You have unlimited texts but only 5 GB of data so you can use your data on something else.