Develop Bugs

3G/HSPA/LTE and SIM cards.

I have read a few comments regarding people using old SIM cards, designed for older 3G phones, I live in an area that does not have LTE and my signal icon reads 4G and service is listed as HSPA under the settings screen.
If I was to get an old 3G SIM would my phone be running only on 3g and stop hunting for LTE signal? Perhaps HSPA towers are the same and my phone already has the connection? As you can see I am a bit confused with the subject
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Its not technically the sim card itself that determines this but the service or carrier that it associated to that matters...and then the phone hardware. The carrier info that passes through the sim tells the phone what network it is on or supposed to use and then searches for that service level dependind on the hardware that's in the phone and the settings one may have the phone set to.hope this makes sense.
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Can a 3G Sim work on this phone?

So, I'm debating right now between the Hox and the gs3 and honestly the only reason why I can't get this phone is because its lte. I use a 3G sim for all my phones (except my nitro, I don't have a sim in that at all) so I need to know if one can insert a 3G sim and still get data. Oh, and I heard this uses a microsim slot? Tim to get my sim cut....
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Both hox and GSIII have micro sim slots. It does have 3g, I use it all the time as there is no 4G in Pennsylvania. Not sure if you'd have to sim unlock it though.
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corythug said:
Both hox and GSIII have micro sim slots. It does have 3g, I use it all the time as there is no 4G in Pennsylvania. Not sure if you'd have to sim unlock it though.
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Oh. Thanks. Just asking cuz my nitro only works with specifically designed 4G at&t sims. All other carriers, whatever sims they give, work fine.
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why are you resistant to update your SIM card? also your 4G LTE connectivity will depend on your data plan.

I had a iPhone 4 3G Microsim and i had to go to AT&T to get a new sim card because my S3 would not pick up data. After a new sim card and adjustments to my account it was finally able to pick data.

J Prime said:
I had a iPhone 4 3G Microsim and i had to go to AT&T to get a new sim card because my S3 would not pick up data. After a new sim card and adjustments to my account it was finally able to pick data.
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Same thing for me, except i didnt need a new sim. All they had to do was change the imei on my account so my phone with that imei can receive data. The rep told me that its because you can only have one phone with data at a time, as opposed to just being able to switch sims just to receice cellular service for calls.

Post questions in QnA please

meaintsmart said:
Same thing for me, except i didnt need a new sim. All they had to do was change the imei on my account so my phone with that imei can receive data. The rep told me that its because you can only have one phone with data at a time, as opposed to just being able to switch sims just to receice cellular service for calls.
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I went through similar a long time ago when I got my Atrix. I upgraded from a iPhone 3G and just continued using same SIM. At&t just updated my data to "4G" and updated my imei and everything was groovy from then on. I'm on a whole new account for my S3 though
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3g will work if you use the regular apn. If you use the LTE apn (PTA), that will only work with an LTE sin card.

Such a thing as a "virtual SIM card"?

I'm going to be travelling in Europe and I wondered if anyone had ever heard of an app or hack or anything that would act like a "virtual sim card."
Basically, it would be cool if my phone could think it had one SIM in there, and then at the touch of a button, if it could think it had another. I'm planning on taking my T-Mobile US SIM to Europe to use WiFi calling from there to be able to talk/send and receive SMS for free from people in the US on my US number. When I'm not in a WiFi area, I'd like to be able to switch to a prepaid SIM that I'll purchase in Europe for data access when I'm out and about (and maybe some text/call abilities with a local number would be nice so I could communicate with friends in Europe).
If there's no way to do this with Android I'll probably just purchase a second smartphone and carry one with my T-Mobile SIM and the other with a European prepaid SIM (and that way I could make a WiFi hotspot so I'm always on WiFi calling).
Any suggestions? Has anyone ever heard of something like this? LIke some app that can "remember" a SIM that is inserted into the phone and then make the phone think that SIM is there when it's actually not? Something to make SIM switching a lot easier, or even something that could switch to the Euro SIM once every 10 minutes or so even when I'm on WiFi to check for new messages on the European number, then go back to the T-Mobile number and turn off all mobile radios so it can connect to WiFi calling.

I would also like this. I hate carrying two phones with me. My work phone has only voice. I would like to have my nexus 4 use my work Sim for voice and personal sim for data at same time.
If not then to be able to switch between them so one is active at a time would be cool.. I bet with a rooted and custom build of android this would be possible. But it is beyond my capabilities.
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How about a sim unlock instead? http://forum.xda-developers.com/showthread.php?t=2023709
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closest to that is a multiple sim, sim card i have no clue how to get or use them though and you might as well just unlock your phone anyway unless you need to do this without changing the physical sim but you may have to anyway with a multiple sim (probably turn it over or something)

Wifi Calling on Family Mobile

A really close friend of mine has the Galaxy S II (T-mobile) and is on Walmart's Family Mobile plan. It does come with WiFi Calling, but it says "Invalid SIM Card ERO5".
From what I remember, Family-Mobile runs through T-mobile's network and WiFi Calling does not cost T-mobile anything to provide us with Wi-Fi Calling. Any insights or solutions are greatly appreciated. Thanks.

Your sim card must be of a certain kind to allow the WiFi calling feature to work. For example, if a T-Mobile customer bought the s2 when it came out in 2011 and had an old/incompatible sim card, they would have to activate the new sim card that came with the purchased phone in order to be able to use the WiFi calling feature.
So a reasonable conclusion would be that the sim card you have currently in your device is NOT compatible. Unfortunately, I don't know the specifics, such as the name or kind of sim card you need, if u were to ask customer service for one. A description of your issue should suffice to let them know what it is that you need.
Hope I'm clear. Good luck.
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bzlik88 said:
Your sim card must be of a certain kind to allow the WiFi calling feature to work. For example, if a T-Mobile customer bought the s2 when it came out in 2011 and had an old/incompatible sim card, they would have to activate the new sim card that came with the purchased phone in order to be able to use the WiFi calling feature.
So a reasonable conclusion would be that the sim card you have currently in your device is NOT compatible. Unfortunately, I don't know the specifics, such as the name or kind of sim card you need, if u were to ask customer service for one. A description of your issue should suffice to let them know what it is that you need.
Hope I'm clear. Good luck.
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This is correct though the newer SIMs have been out since the first Samsung galaxy (vibrant) hit tmobile. I will say sometimes when I used to use ics ROM with Wi-Fi calling that some times it would throw an error and I would have to restart to get it running. You also need to usually login to the customer portal or call customer service and set the E911 address before it fully enables on the phone.
Wi-Fi calling is not that great, plenty of lag and other issues that make the call quality pretty bad even on great internet connections.
Especially with tmobile doing the $50 everything unlimited with no contact plan (and similar plans for contract phones), it's worth just going that way (tmobile even accepts customers with pretty bad credit so don't let that stop you).
If you want to stay with Wallys World for whatever reason I bet they also have a similar deal.
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Hello, I am a former Family Mobile service user and i am sorry to inform you that Family Mobile does not offer WiFi calling.

I had a Galaxy S 4G with wifi calling, and when I upgraded to the T989 a couple months ago, wifi calling wouldn't work with my sim card (though everything else worked). I went to the Tmo store and they gave me a new SIM for free, and now everything works.
So if FM does support wifi calling, you may just need a newer sim card.
and wifi calling works great for me. clear, and no echo. It's actually better than every other voip app I tried on the market. I'm on unlimited, but I have a very weak signal at home, and therefore must use wifi calling

I have WFMobile and it seems to keep ER05 on my phone beeps and rings it's annoying. I have WiFi calling turned off. I don't know how to get away from it.

Many retail mobiles have "Wifi Calling" function but not any menu entry to enable , There is a APP can check the hidden function and enable it if can use.
https://play.google.com/store/apps/details?id=com.widget7.wifi.calling

[Q] Fake 4G for sim card

Hi,
French mobile operator http://mobile.free.fr/ activate 20go of data for 4G mobile only.
Sim card can detect if phone is 4G LTE ready or not.
Is it possible to create a patch and transform Note2 3G to Note2 LTE and fake sim card?
Thanks developers

No... Not really...

If the data is on a 4g lte network then im afraid you need a 4g phone to connect to a 4g network
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No no,
There is only a limitation when smartphone was detected of a 4G ou 3G module.
A 4G phone can have 20gb data even if a force 3G connection.
I learn the network verify if there is a 4G phone with his IMEI.
So i must modify it in EFS with a 4G phone to test it
But il never see solutions for that.
I only see IMEI modifications for Galaxy S3 :/