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Thread: Field test mode

  1. #1
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    Field test mode

    Got a new iPhone 11 pro today. Was driving down the freeway and field test showed band 25? I’m on Tmobile not on sprint. Any ideas? Other times showed band 66.

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    Quote Originally Posted by skierrob View Post
    Got a new iPhone 11 pro today. Was driving down the freeway and field test showed band 25? I’m on Tmobile not on sprint. Any ideas? Other times showed band 66.
    Any pics of it? That helps better

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    Here you go for a photo Name:  F75A4849-79A2-44A0-9ADF-6ECCEE7879A7.jpg
Views: 155
Size:  22.1 KBName:  F75A4849-79A2-44A0-9ADF-6ECCEE7879A7.jpg
Views: 155
Size:  22.1 KB

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    Quote Originally Posted by skierrob View Post
    Here you go for a photo Name:  F75A4849-79A2-44A0-9ADF-6ECCEE7879A7.jpg
Views: 155
Size:  22.1 KBName:  F75A4849-79A2-44A0-9ADF-6ECCEE7879A7.jpg
Views: 155
Size:  22.1 KB
    MFBI possibly? Not sure. I know that would happen under the merger but not while they are still separate

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    Sorry what is mfbi?

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    MFBI stands for Multi Frequency Band Indicator -- some LTE bands are super sets of the others. For example, Band 25 is a superset of Band 2 -- Band 25 has 5 mhz extra on the top end compared to Band 2, and Sprint holds the license for Band 25 in the US. The tower can emit multiple band indicators for a particular frequency (so even if T-Mobile is only broadcasting on the Band 2 frequencies, the tower can say it's Band 2 and Band 25, so a phone with only Band 25 compatibility will lock onto the signal.

    FYI, Sprint uses Band 25 (1900 extended PCS), 26 (800Mhz) and 41 (2500 Mhz) for LTE, so all of their LTE devices have at least these 3 bands. Since T-Mobile doesn't use any of these, for the roaming to work on all Sprint devices, the T-Mobile sites have to "announce" a presence on Band 25. Many modern / flagship Sprint devices (e.g., modern iPhones/Galaxy devices) also have Band 2/4/12/66 and/or 71 compatibility and thus can roam on those, but not all Sprint devices cover those bands... which makes Band 25 the most commonly overlapped band.

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    Quote Originally Posted by high technology View Post
    MFBI stands for Multi Frequency Band Indicator -- some LTE bands are super sets of the others. For example, Band 25 is a superset of Band 2 -- Band 25 has 5 mhz extra on the top end compared to Band 2, and Sprint holds the license for Band 25 in the US. The tower can emit multiple band indicators for a particular frequency (so even if T-Mobile is only broadcasting on the Band 2 frequencies, the tower can say it's Band 2 and Band 25, so a phone with only Band 25 compatibility will lock onto the signal.

    FYI, Sprint uses Band 25 (1900 extended PCS), 26 (800Mhz) and 41 (2500 Mhz) for LTE, so all of their LTE devices have at least these 3 bands. Since T-Mobile doesn't use any of these, for the roaming to work on all Sprint devices, the T-Mobile sites have to "announce" a presence on Band 25. Many modern / flagship Sprint devices (e.g., modern iPhones/Galaxy devices) also have Band 2/4/12/66 and/or 71 compatibility and thus can roam on those, but not all Sprint devices cover those bands... which makes Band 25 the most commonly overlapped band.
    Every Sprint phone from 2015 on supports B2,4, and 12. Recent ones I also support 66 and 71. So I'm not sure what's going on. I know new TMobile will do 25 and 2 under the merger. For sure in cities where TMobile holds the C block to do C+G

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    Yeah I'd say MFBI. Just like bands 25 and 26 have been seen on VZW.

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