After the mobile phone makes work, Chengdu apple maintains common a few big trouble, chengdu apple mobile phone maintains an address:
The Chengdu City road of red star of area of bright and beautiful river square of 3 paragraphs of 99 silver-colored stone 24 01 rooms
The road in people of division of black sheep of the Chengdu City square of international of 2 paragraphs of 29 peaceful abundant 23 04 rooms
Advisory service 028-84356272
alleged person does not have perfect man, again outstanding mobile phone also can appear various problems, more what is more,the rather that the mobile phone is industrial product, have now and then " slight illness " also be unavoidable. The convention that uses a mobile phone in the everybody in daily life is endless also and identical, some users are special cherish a mobile phone, fully armed (stick film to wear housing again namely) . Some users treat it as communication tool, "Streaking " (do not stick film, do not wear housing) the value that will reflect it.
Do not have signal suddenly below normal use circumstance, how should be we done? Premise is the machine that do not have a lock (except of machine having a lock) .
Solution: 1, enter [setting] - [general] - [about this machine] examine [modem firmware] from the back whether version shows, this version shows represented share of mobile phone base band (the module that matters with communication) regular job; If [modem firmware] without version information, this shows issue of existence of part of this machine base band, encounter this kind of situation normally, a few users undertake brushing with respect to the tutorial that goes up according to the net machine, result ITunes signs up for a fault, switching on the mobile phone is the interface that resumes pattern, cannot enter advocate interface.
Most propbably appears this kind of circumstance, to maintenance engineer maintenance rises difficulty also is very great, because brush the machine after machine newspaper is wrong to switch on the mobile phone,base band is not started, cannot measure all voltage so. Holding the manner edge that have a try in the arms to brush plane side to measure, can be imagined difficulty has how old. When so modem firmware does not have version information, cannot brush machine, need to send the overhaul.
2, whether has examination IPhone identified SIM card, [install] - [general] - [about this machine] - [ICCID] , if this shows all right, prove the mobile phone has been read take SIM to block message, if do not have this to show with respect to the delegate the mobile phone does not read card all right, cause the account that does not read card to be basically: SIM card attaint, contact is undesirable, advocate board SIM card is read take circuit problem and communication CPU trouble. What we can do is clean SIM get stuck or change SIM gets stuck, check afresh. If still do not have signal, do we need to check mobile phone time accurate? If forbid truly, need to proofread time, restart check again, still do not have signal, [about this machine] the information inside exists, can choose to brush machine, do a last hurrah. If still do not have signal, be forced to look for maintenance businessman to undertake was maintaininged.
The cause that causes signal trouble has: SIM card expires, contact breakdown of circuitry of antenna of undesirable, signal, advocate board signal is relevant chip breakdown; Different breakdown upkeep costs is different.
