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Das iPhone 6 Plus mit dem 5,5 Zoll Display ist die größere Version des iPhone 6 und seit dem 19. September 2014 auf dem Markt.

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Very weird no service issue but works fine with Vodafone..

Hi all

I thought I’d post this here to share an experience, and for anyone having a similar issue who may stumble across this thread - it may not provide a solution but it may save someone headache and effort trying to track this issue down. I’m not expecting an answer that will help with this, although I’d be seriously impressed if there is one!

I have an iphone 6 Plus, this phone was originally network locked to Vodafone. The phone works 100% fine with a Vodafone sim. This phone has now been unlocked by Vodafone around a month ago. Here’s the issue.. The phone will now accept sims from any network i.e it doesn’t show the sim locked screen, however I’ve tried several fully working sim cards from various networks with no luck! I have full reception in my area with Vodafone, O2, Three. When trying a Three sim card I get no service, Giff Gaff (operated by O2) I get no service. Strangely when I try an o2 sim, I get the o2 signal bars but they are all grey, so it shows o2 but with no signal and shows call failed whenever trying to make a call, however mobile data 3G and 4G works fine, with wifi switched off I can use 3G/4G with a reliable and fast connection. A Tesco sim (operated by o2) does the same. If I didn’t know better I’d have thought the phone may be blocked on these networks however o2 have confirmed it isn’t. To add to this I’ve managed to get the Three and Giff Gaff sim to work but only once after countless retries.

The IMEI is showing fine when dialling *#06#, the IMEI, modem firmware, ICID are showing in settings. The correct carrier also shows for all sims.

Inspecting the board there are no signs of water damage. It seems Tristar and Tigris have been replaced in the past. Struggling for ideas, and thinking it may be something baseband related I’ve reballed BaseBand and done the U1/V1 (long) jumpers. Needless to say this has made no difference. I’ve probed around in diode mode and found nothing that looks odd. Voltage wise I’ve found an issue with the output voltage from U_QPOET (VPA_APT), I’ve replaced U_QPOET and still have the same issue so I think this is more of a symptom than a cause. I’ve also replaced U_WTR_RF but to no avail.

I can only conclude there must be trace that has been damaged or possibly a cracked ball somewhere, but it seems whatever it is isn’t required by a Vodafone sim, which I find very interesting. I’m not sure if this is purely coincidence that the original provider was Vodafone, I think it must be. I’m not sure if there is some fundamental difference in how a Vodafone sim connects which allows the Vodafone sim to work or if it’s because Vodafone was the original provider, or is there a data line broken that tells the phone how to connect.. I suspect it’s more likely that Vodafone/the setup on the Vodafone sim cards allow the phone to connect differently than other sims, the reason I say this is I still don’t see the correct output voltage from U_QPOET even when testing with a Vodafone sim.

Very very odd, it’s a shame but I think this is another phone heading for the scrap heap :(

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I assume you have completed a full restore to rule out software and tried it in another known good housing to rule out parts.

This is what I call the rabbit holes of all rabbit holes. About 4 years ago I had a similar problem I replaced all the RF chips on the bottom of the board plus ran the two jumpers I even replaced the sim tray and ran the second jumper under it. I also got trolled with voltages but I found if restoring with 3uTools about 80% when doing the baseband firmware all the correct voltages showed up.

I than replaced the Wi-Fi IC and all the RF components around it just in case it had something  do with it. I than did a board swap which resulted in a short under the PMIC and a short on the 1V8 sdram. After replacing the PMIC and re-balling the ram again I did a full restore only to be confronted with the same problem.

I am not sure if the phone had ever been locked to a certain network but after about 40 hours of trying to do the repair I conclude it must be the CPU or baseband.

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