My family just switched to XM and bought 2 new iphones and 1 new Samsung phone. One of the iphones is set where cellular data is turned off and the other iphone has cellular data turned on. The Samsung phone is set to no mobile data. The iphone that has cellular data turned off, can't receive or send any messages that include a picture, even when on our home wifi but the Samsung phone has no issues with sending and receiving pictures except if a picture is sent to the iphone with cellular data turned off, they won't get the picture.
This issue of not being able to send or receive text messages on wifi, seems to be an iphone issue or an xm/iphone issue. This is one of the reasons I hate Apple products. They're too controlling. You wouldn't believe the trouble I had after trying my son's old iphone for 2 weeks and then switching back to an Android phone. No one with an iphone could send me text messages cause Apple kept my cell phone number in their cloud for over a month.
Really odd. You'd think it would be the opposite actually since iMessage, iphone to iphone, actually goes over a data service signal. For example, I currently have no service in my building, but I can text back an forth all day via iMessage on the wifi.
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It's actually illegal for a carrier to refuse to port a number. I'm trying to bring my iPhone to try Xfinity, but AT&T has been charging me more that double for the plan I have for the better art of a year and I've just had it with their refusal to come correct. My SIM arrived and I'll be trying to port tonight of tomorrow, but I did notice the stipulation that your account with current carrier must be paid – unless you buy a new phone. This is not true/legal. You can read the FCC’s law here: https://www.fcc.gov/consumers/guides/porting-keeping-your-phone-number-when-you-change-providers
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