Tello Plans to Convert to GSM

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3 months 3 days ago #1 by Frasier1
Tello announced recently that they plan to convert to GSM by "the end of the year". Tello said if you have a CDMA only phone you will need to get a new phone that is GSM. They also said there would be a faze-in period to give CDMA customers until June of 2021 to switch over.
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3 months 2 days ago #2 by Extraterrestrial_Zoologist
Could be a great thing for many folks depending upon which GSM network they use & how it may affect their pricing.
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3 months 2 days ago #3 by tech-stitch
This, I am looking forward to! I will take them in heartbeat either with AT&T or T-Mobile provided their customer service remains solid. I just hope that their rates remain close to the same if they do have to make adjustments. This does makes me think about the people that I referred to that may not have a clue that this is taking place. Thankfully, those people had carrier agnostic phones then, so AT&T or T-Mobile will work. Looks like I will have some work to do to help out those folks.
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3 months 2 days ago #4 by st3fx
Replied by st3fx on topic Tello Plans to Convert to GSM
Please see this earlier thread for more information:
www.nthcircle.com/forum/tello/3493-tello-and-the-t-mobile-sprint-merger
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3 months 1 day ago #5 by Phoniac

Frasier1 wrote: Tello announced recently that they plan to convert to GSM by "the end of the year". Tello said if you have a CDMA only phone you will need to get a new phone that is GSM. They also said there would be a faze-in period to give CDMA customers until June of 2021 to switch over.


Don't all CDMA phones have GSM radios? Thereby making it possible to use a GSM SIMcard in a CDMA phone?

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3 months 1 day ago #6 by johnsmith

Phoniac wrote:

Frasier1 wrote: Tello announced recently that they plan to convert to GSM by "the end of the year". Tello said if you have a CDMA only phone you will need to get a new phone that is GSM. They also said there would be a faze-in period to give CDMA customers until June of 2021 to switch over.


Don't all CDMA phones have GSM radios? Thereby making it possible to use a GSM SIMcard in a CDMA phone?


Not all CDMA phones have sim cards.

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3 months 1 day ago #7 by KentE
Replied by KentE on topic Tello Plans to Convert to GSM

Phoniac wrote:

Frasier1 wrote: Tello announced recently that they plan to convert to GSM by "the end of the year". Tello said if you have a CDMA only phone you will need to get a new phone that is GSM. They also said there would be a faze-in period to give CDMA customers until June of 2021 to switch over.


Don't all CDMA phones have GSM radios? Thereby making it possible to use a GSM SIMcard in a CDMA phone?


The first hurdle to get over here is a SIM lock. (For example, phones that are locked to Sprint or Verizon networks.)

The second hurdle is software radio blocks. (I think the 2nd Gen Moto E referenced in the other thread had this issue, but fortunately a user-initiated process to bypass the block.)

The third hurdle is band support, which may be the same or different than software radio blocks. (LG, for example, seemed to make a lot of custom variants for different networks that simply did not include band support outside of the branded carrier.)

The fourth hurdle is whether the phone supports features needed by other networks. (Examples would be T-Mobile or Verizon VoLTE certification.)

The newer a phone is, the better the chance that some of the hurdles might be manageable. There seems to be considerable consumer hope that T-Mobile will clear the first hurdle for Sprint-network locked phones as part of the transition-- but I haven't seen much indication that this will be true for older phones, and it's likely to be irrelevant if the other hurdles are still barriers.

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3 months 22 hours ago - 3 months 22 hours ago #8 by mmfacemm
I read somewhere that sprint phones work woth tmobile sims now (assuming they are compatible). Haven't tried it though. If true no need to worry about unlocking.

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3 months 21 hours ago #9 by KentE
Replied by KentE on topic Tello Plans to Convert to GSM

mmfacemm wrote: I read somewhere that sprint phones work woth tmobile sims now (assuming they are compatible). Haven't tried it though. If true no need to worry about unlocking.


I think that would be the first hurdle I mentioned: SIM locking. That does seem quite easy for new T-Mobile to allow, if they're inclined. It might take a profile update to enable it? I don't know the exact process.

I'd certainly give it a try, but I don't think I have any devices here that have that as the only hurdle. I do have have a couple that are both SIM-locked and have software radio blocks. I doubt T-Mobile is going to do anything to fix those.

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2 months 2 weeks ago #10 by idanth

Phoniac wrote:
Don't all CDMA phones have GSM radios? Thereby making it possible to use a GSM SIMcard in a CDMA phone?


1. Old CDMA phones (even those supporting LTE) do not have SIM card slot.
2. Some CDMA/LTE phones do not support GSM (and T-Mobile's VoLTE).
3. Some CDMA/LTE phones have GSM radio but it is locked forever and can not be used.
4. Some CDMA/LTE phones (for example ZTE Prestige 2) have GSM radio that can be unlocked using some kind of hacking. But these phones do not support T-Mobile's VoLTE and their usage is very limited on T-Mobile network.
5. Some CDMA/LTE phones have GSM radio that can be unlocked easy (using unlock code request). But these phones do not support T-Mobile's VoLTE and their usage is very limited on T-Mobile network.
6. Only Sprint branded iPhones, latest Samsungs, some LGs (and may be few other models) can be used on T-Mobile network without problems.

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