henry scheele Thanks!!

Walide Saeed Thanks!

@@MattDiehl639 for gsm If a phone is blacklisted will it be blacklisted to all gsm carriers all over the world? Or all gsm carriers in the USA only? Or only the gsm carrier when it was blacklisted??

You're welcome. Glad you found this helpful.

Wow...I had it clear in my brain until I read your comment, lol!

+anand swarup I'm glad you found it helpful.

john jeremias The consensus is that LTE uses more battery than the other technologies.

I doubt it. I have family members who were on Sprint. I think T-Mobile is phasing out Sprint's old network, as a family member with a Sprint Galaxy S7 (and a new T-Mobile SIM) was forced to upgrade.

Absolutely! AT&T prepaid phones and Cricket phones can be used on AT&T's postpaid service.

Awesome, thanks for clarifying. Your video has made the foggy part of my job way easier.

Glad I could help. I've been working in wireless for 6 years, and I had no formal training on the job.

I'm simply overwhelmed. I had no idea so many factors came into play.

+Anthony Anderson 1.Everything you mentioned about GSM phones and unlocking them is correct. 2. You are correct that you can't use a CDMA phone on a GSM network (and vice-versa). 3. Most of the time, you cannot move a CDMA phone from one CDMA service to another. SOMETIMES you can, just consult the carrier you want to use. Sometimes, I was able to move customers' Sprint (CDMA) iPhone 4 phones to CDMA prepaid brands that ran on Verizon (CDMA). I know it's confusing, but you got it right.

Wow someone finally answered this question I've had for a very long time lol. Thank you good sir! Now I have one more question if you don't mind... Since all 4G LTE phones now have SIM cards (Even CDMA), that doesn't that they are necessarily compatible with each other now right? Just because AT&T uses Sim Cards but so does, lets say a Verizon Galaxy S7 (the phone doesn't matter, just throwing a name out there), That doesn't mean I can now take my At&T SIM and throw it in the Galaxy and it will work right? Or the other way around. Take my at&t phone and get a Verizon SIM. You said every once in a while you will get a phone that is compatible for both (like the iphone 4), is there anyway way to find out if the phone I have will be one of those lucky phones? Like a website perhaps? or anything really? Again thank you so much!!!

Anthony Anderson You actually could use a VZW 4G phone on a GSM network. HOWEVER, (while an actual AT&T or T-Mobile SIM card will likely work), some of the prepaid brands that piggyback off of those 2 carriers won't let you use a VZW 4G phone on their service, because their network will see your phone's VZW IMEI.

Matt Diehl so then how will I know if a Verizon phone that I purchase will be compatible with a GSM carrier for sure? I see these guys selling Verizon phones on eBay and they have them unlocked to work with like 3 or 4 GSM carriers? How are they doing that?

Anthony Anderson Most of VZW's 4G phones come unlocked out of the box. If you go into the settings menu of a VZW Android phone, you can change the radio mode to LTE/GSM. Once you've done that the phone can work on AT&T & T-Mobile. Keep in mind you won't get LTE or software updates without connecting the phone to VZW. If you want to use an unlocked VZW 4G phone on AT&T or T-Mobile, I would advise against buying a SIM card thrpougj anyone other than those 2 brands. Also, I'd recommend buying a used phone through a site like Swappa, rather than eBay. There are people who fraudulently purchase phones, and then sell them online, after the carrier blacklists the phone. Hope this helps

All you should have to do is go into that VZW LTE phones' cellular radio settings, and change the preferred network from LTE/CDMA to GLOBAL or LTE/GSM (or WCDMA). However, that phone won't get LTE connectivity unless it is running on Verizon. Plus, on T-Mobile, your Verizon phone (if it's an Android) will not be able to get software updates.

I'm guessing unawareness. I didn't know about this CDMA vs GSM stuff until just now, several years after we already bought the Verizon plan.

like you said, most of VZW's 4G phones are unlocked, because of a rule that the FCC imposed on VZW. Unfortunately, Sprint's 4G phones are not unlocked, nor can they be unlocked.

+Richard Melim Unfortunately, to use Sprint, you'll have to buy a phone from Sprint, in most cases. CDMA a more restrictive technology, plus Sprint uses an odd set of radio frequencies. The only unlocked phones I believe you can bring to Sprint are the Nexus 5, Nexus 6 5X, 6P, and the Pixel.

Matt Diehl Thanks so much for your feedback. You are so helpful. Happy NEW Year!!! 😀🖒

+Richard Melim Thanks! Glad I could help. Happy New Year.

I really like Metro PCS.

It sounds like your Consumer Cellular phone runs on AT&T. I recently got an email from AT&T saying that they're going to shut down their 3G network in February, 2022. Even though I was using a 4G LTE phone like your Samsung, 4G phones need to be able to connect to 3G as a fallback for when 4G service isn't available. When AT&T shuts down its 3G network, 4G phones without VoLTE, won't get voice service without 3G. VoLTE (or voice-over-LTE is (in plain engligh) the ability to make voice calls through your phone's data plan. Some 4G phones have voice-over-LTE, others (like your phone and mine) do not. Overall, your 4G LTE Samsung has to use 3G when you make phone calls. When AT&T turns off its 3G network un February, 2022, you'll have to have a phone that has VoLTE, to make phone calls. Your current phone is apparently missing that feature. I hope this helps.

@@MattDiehl639 Thank you very much for your feed back. I really appreciate it! Now I understand.

Gaurav Jindal thanks!

Verizon and Sprint have CDMA as a backbone, although all 4 American network s are placing a big emphasis on deploying LTE (4G).

Araya Khan It depends. Although most of VZW's own 4G postpaid phones are already unlocked, I'm not sure if their prepaid 4G phones are unlocked, as well. As for phones on an MVNO that uses VZW (e.g. Straight Talk, Total Wireless, etc.), those phones will only accept the one SIM card that comes with the phone. You'll have to talk to your service provider to see if it can be unlocked.

Matt Diehl ✌ wow that was quick thank you so much u r great. I'll ask the provider. Yes i used straight talk prepaid phone 😇

Yeah, I know what you mean. This was one of my early KZfaq videos, before I was able to get a good grasp on video editing software.

Well, just a simple white bd. and marker would have been helpful. And then point to this and point to that. But that time has passed. Thanks for the information anyway. I think I'll go with T-Mobil