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这款4.7英寸iPhone于2014年9月19日发布,是iPhone 6 Plus的缩小版。

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Phone connection sometimes dissapears

So the connection sometimes works, and sometimes it shows "No service" (in the same place) whats the problem? Everything is ok with wifi it does not dissapear.

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In order of opperations, id look into the following.

Check for Continuity: Does you service only drop in one place? in basements only? Service has difficulty pennetrating concrete and metal. basements, and steel buildings commonly cause service issues.

Call SP: your service provider may be having intermittant issues in your area.

Check SIM: Your SIM card may be failing. Make sure to have your SP change your SIM every year.

Verify Fringe Service Zones: More country like areas have whats known as Fringe Service, which means there is low signal there on the regular.

Factory Reset: Your device software may have become corrupt. A factory reset can fix this issue.

Change Cellular Antenna: Replace the Charge flex w/ Cell antenna. this may be failing.

anything further than this is a board level failure.

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Thanks,

P.S. the connection dissapears randomly, where the signal is usually good

absolutely. this is simply a full cellular diagnostic. this goes from least invasive, to most invasive of a repair. i hope it helps you figure out what is wrong

Could it be motherboard fault?

that is the last line on my answer. yes

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