It has all of the Bands necessary to work with ATT, some but not all on TMobile. If you are on Verizon or Sprint good luck. While Verizon as of Jan 1 will no longer activate CDMA devices only on their Network theoretically you could activate any GSM device on their LTE Network. Whether not they will is another story. Using MVNO's I am finding is a better experience than the parent company. Never had any issues using different features like call forwarding on Cricket using Int'l versions of Galaxy devices. Switched to At&t for a feature I was needing just not offered on Cricket. Only to find out they have a policy to block carrier features like call forwarding, wifi calling, VOLTE, etc because they won't provision the device for their network. Sure it will activate on their network, they intintially block features to get you to buy the carrier version of the phone. The Note 10 is a great phone but plagued with lower general cell reception. I live in the foothills to Smoky Mountains and so low reception at work already but it always works. Note 10 kept dropping. Apparently carrier and non carrier US models experience this dropped in signal strength overall too. Because AT&T won't allow non carrier devices to use their features (but still charge you for them) I couldn't use Wifi calling. The device didn't drop connection all the time but enough where I missed a few calls and SMS. Tmo told me they don't lock out features based off where your device is from, but not worth switching carriers at this point just returned phone and went back to US UNLOCKED s10e which doesn't have the issues Note 10 had.
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AT&T is hit or miss with this feature I think right now. I have 4 lines with AT&T, all are unlocked S10e's. Two are Global Versions and two are US Unlocked direct from Samsung online. The 2 US versions had all the bells and whistles that AT&T offers, minus being able to use AT&T Visual Voicemail app, however, Samsung includes their Voicemail app on the Unlocked US version, so all is fine there. The other two S10e's that are Global (dual-sim) versions, while can be used on the network, do not get VoLTE, even the phones themselves support it. They have all the necessary bands still for AT&T, so its not an issue with that. Biggest difference is they have the Exynos SoC, instead of Snapdragon from Qualcomm. So most likely AT&T did not feel like provisioning each part to their system. I know it comes down to what is called provisioning, which used to be synomous with Carrier Locked, as it was the only way for AT&T or any of them to make sure everything worked with their networks. Things have moved forward a little bit to keep it all more streamlined, but it still a bit messy. I just switched to the Note10 myself, Global Version, but this one has the Qualcomm SoC. Trying to wrap this up here...I cannot on either of my S10e's nor my Note10 setup call forwarding because it is not provisioned on the network. On my Note 10 I couldn't even access voicemail! I did a chat session with AT&T for the VM to get functioning and then another one to work out the Call Forwarding. They are saying it is my SIM which is brand new and I have no issues with in the last phone or this (only a 6 months old at this point). The call forwarding is supposed to be handled by Android and sends the request to AT&T server to turn it on, but its not even recognizing my device, but the device still works to make calls, SMS, and data. So there are switches they are going to have to manually turn on/off for me, but I'm not 100% if this will be device version dependent. It does take about 48 hours on the network before somethings register. Mostly this was to give you hope and another avenue if you haven't tried already. T-Mobile is one of the best (now) at BYOD and getting all the features they offer, just too bad the coverage still bad (at least rurally).
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