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La versione 2016 del telefono economico Samsung Galaxy A3 (numero modello: A310F).

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Samsung Galaxy A3 2016 (A310f) signal problem.

I got a signal problem on my a3(2016) a310f.It's only get 4g & 3g signal.When I changed to 2g signal it says no connection.Allso I can't make calls some time.Check these attachments.

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My phone juse went off and doesnt want to go on ....its only been a year I've bought it .What could the problem be ...?


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Does your network service provider support 2G in your location? Check your provider's website to see if they still have a 2G network and if it is in your location.

What happens if you select 2G and then do a manual search for other mobile networks? Do any show up?

A lot of service providers have shutdown their 2G network and the frequency has been reallocated to the 4G/LTE range.

Update (11/28/2016)


Do you know if it has ever worked? Also is the phone still under warranty?

You will have to find the problem by a process of elimination. You already know that the SIM card is not the problem. Next is to determine whether it is a hardware or software problem.

I suggest that you backup the phone using the phone's back up feature, ensure that the battery is fully charged and then perform a factory reset on the phone, using the phone's factory restore feature.

Be aware the a factory reset will erase all your user data and downloaded apps. It will restore the phone to a factory default condition. It will be like when you first bought it. That is why it is important to do a backup first before the reset.

Once the phone has been restored to its' factory default condition check to see if the 2G now works correctly.

If it doesn't then there is a problem most likely with the hardware of the phone and if it is still under the manufacturer's 12 month warranty, consult the warranty documentation that came with the phone (or look online if you can't find it) to see what you have to do to make a claim for a warranty repair or replacement.

If the2G works after the reset, then restore the phone from the backup you made earlier using the phone's restore feature.

Once the phone has been restored, check to see if the 2G is still working correctly.

If it is then the reset has corrected the problem.

If it is again not working correctly a downloaded app may be causing the problem. The trick is to find out which one. You need to uninstall each downloaded app one by one and test the2G after each uninstall to find the one which is causing the problem.

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HI @axen ,

Have you tried a different known working 2G, network compatible SIM card to see if it is the phone that is the problem? Have you tried your SIM card in a known working 2G, network compatible phone to see if the 2G works in it?

In other words, swap SIM cards with another phone, which has 2G working on the same network, and see whether the problem stays with your phone or moves to the other phone.


Hello @jayeff

sim card works perfectly.I used different sims on my phone.But still no 2g.


Hello @jayeff

I did reset but nothing happened...So I am going to repair this phone.If flashing the phone could solve this?


Hi @axen ,

If I were you, since it still should be under warranty, leave it reset - factory default condition (that way your privacy is protected) and make a warranty claim for a replacement as it obviously doesn't work. To me it would be more of a hardware problem than a software problem especially if you cannot detect other 2G networks either.

Do not compromise your warranty by either flashing the ROM or opening the phone.

Get a new one!


Hello @jayeff

I did a hard reset and wipe cache is that void the warranty?


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I have the same problem, how did you fixed it? Of course, if you did.

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I didn't fixed it yet.... :( I tried a reflash but nothing happened...


I have same problem in my Sanding A3

How to solve?


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Thank you for your reply.

I checked that...It's not a provider's issue.issue is on the phone.I can't figure it out,is it software or a hardware issue.

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Anushka Ranganath sarà eternamente grato.
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