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My wi-fi is just a mobile broadband router. I also use wi-fi spots in locations I frequent often. Have 4GB on my iPhone and 200GB on my mobile broadband router per month. Own a USB LTE router as well that is portable for overnight stays. Use my retina Macbook more on trips I do alone than my iPhone.
 
Turn off WiFi assist, then you can leave it on without worrying about it using your mobile data.
Wifi assist moves the line in the sand for when mobile data is activated from no wifi to lousy wifi. If you want to ensure no mobile data is ever used turn off the data.
 
Unless you have a minuscule data allowance (its nearly 2016, so there isn't really an excuse for that these days!) there's no reason to turn it off.
 
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Paying for unlimited data so I utilize it. Cellular data is always on and if I'm in a place where the wifi is slower than LTE, I'll turn the wifi off and continue to use cellular data.
 
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Still using iOS8, so now wifi assist option...
Then realistically it would only jump back if the WiFi signal is not working or is unavailable. Sounds like there would be something going on with WiFi then, rather it being something that happens unnecessarily.
 
For me, even when I'm on WI-FI, DATA needs to be ON to send pic text. I don't understand why? Yet normal text, doesn't require WI-FI nor DATA.

Yes, mms needs carrier data to be on.
Imessages can go thru via wifi and no carrier data.
But sending pic messages will not go thru if you turn off carrier data.
 
Yes. Never turn it off. I use cellular data all the time since it's way faster than my home wifi and I have unlimited data 🙂
 
Only time I turn it off is it I am in a weak cell area and need the battery to last that extra mile that day (e.g. if I am on a trip).
 
My wi-fi is just a mobile broadband router. I also use wi-fi spots in locations I frequent often. Have 4GB on my iPhone and 200GB on my mobile broadband router per month. Own a USB LTE router as well that is portable for overnight stays. Use my retina Macbook more on trips I do alone than my iPhone.
Wow, how much does 200GB per month cost?
 
Are you talking about MMS and SMS or about iMessage?
PICTURE TEXT won't send at all whether it be MMS or SMS. I need to have DATA ON. It's strange. I was under the impression PICTURE TEXT was under the my free unlimited texting plan. Also, when on WI-FI, I also need to have DATA ON to send Picture texts.
 
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