Z1 (Germany) no incoming calls by full signal (LTE, 3G, H+, etc.)

Hello there!
Since a few weeks I've the problem that - from time to time - nobody can call me although my signal is very good.
The caller is being forwarded to the mailbox, because my phone is not available. And also text messages do not come in.
When I do a restart, I get several SMS with notifications from hours/days before, that I had a call in absence.
Latest example is from today: Yesterday, my girlfriend tried to call me several times but couldn't reach me and I didn't get any text messages. This morning, I've tested it again from different phones with different networks (friends and even with my boss at work). Nothing, I'm totally unavailable.
=> There's no effect on the internet connection. Whatsapp messenger is woking fine. Only SMS and phone calls doesn't work.
My Service-Provider: Telekom D1 (no issues here. Friends with the same SP do not have this problem)
My Phone: Xperia Z1 (C6903)
Android: 4.4.2
Build-No.: 14.3.A.0.757

In other forums people say that there might be a problem with the LTE connection or more specifically the switch from LTE to 3G!?
Also I had the issue that I called the person back (after he/she told me via whatsapp that I'm not available) and suddenly the connection broke.

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I went through the same with Verizon at my house. I had been a Verizon subscriber for my personal cell phone since the summer of 2001 until 3-4 months prior to the iPhone being released. While a close friend of mine was visiting for a few days who is an AT&T subscriber, he had much better reception at my house - not 5 bars but much better than the 1 bar I had with Verizon. I contacted Verizon technical support who told me the very same - they are not responsible for reception inside any building - too many factors with building materials, etc. Verizon updated the software on my phone, replaced the battery, sent someone out to my house and neighborhood to check reception, gave me another phone to use as a test but at the end of the day, nothing changed so Verizon let me out of my contract with a year remaining without charging me the early contract termination fee. I use my personal cell phone in place of a landline so reception at my house is important. I have much better reception with AT&T at my house - both with my first subsidized phone and with my iPhone.
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The phone on the iphone is not the best. I live in Dallas and when the phone is on 3g it really is unusable. Just for grins I started a call log for a day. In my very unscientific experiment I dropped (or couldn't hear the person and had to call back) 76.6% of my calls when I 3g for the day. In my opinion, Apple or no Apple, this is unacceptable for any cell phone. I tried calling ATT to see if I could get some credit and they said no. I have taken the phone to the apple store and they said it was the network not the phone. I have restored the phone, reset the phone, updated the phone, and still nothing seems to work.
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When I am on my iPhone with a full or close to full signal, the sound cuts out for a while and then come backs a few times, and eventually drops the call. Its not every now and then...it's every call!
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This does sound more like a faulty antenna than a SIM card problem to me. It may be that when the iPhone switches towers, as it does periodically, even when on full or near full signal strength, there is a time lag between disconnecting the previous tower and locking on to the new tower. This used to be a problem with old analogue mobiles that employed "hard" handoffs rather than "soft" handoffs, where the new tower is locked on to before disconnecting from the previous tower. In any event, with digital phones that still use hard handoffs, the technique has been refined to the point where the change is said to be imperceptible (does anyone know whether the iPhone employs hard or soft handoffs?).
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Hi,
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http://manuals.info.apple.com/en/iPhoneUserGuide.pdf
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Dear arob615,
Reduce the resolution.
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Incoming calls problem!

HiIs there anyway i can make incoming call open full screen as in Lolipop you just have the small window saying acept or reject and in bright sunlight it hard to seeI am sure I had it open full screen or dialer before but been to call setting and can not find any thing

You would need to use a 3rd party app for that as there isn't an option for this to be changed or modified

I can call out but all incoming calls are going directly to VM with no signal that I missed a call or have VM. I can send/receive text messages from other iPhone/iPad/iTouch users, I am assuming this is really "iMessage." Is it apple software?

I have spent hours on the phone with Apple and AT&T. I went thought reset, on/off, etc, etc with both companies to no avail. Each company pointed fingers at the other....as being the source of the problem.
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jsavage9621,
It pains me to hear about your experience with the Home Phone Connect. This device usually works seamlessly and is a great alternative to a landline phone. It sounds like we've done our fair share of work on your account here. I'm going to go ahead and send you a Private Message so that we can access your account and review any open tickets for you. I look forward to speaking with you.
TrevorC_VZW
Follow us on Twitter @VZWSupport

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Hi there,
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Miss liberty

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Restart: Press On/Off button until the Slide to Power Off slider appears, select Slide to Power Off and, after It shuts down, press the On/Off button until the Apple logo appears.
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Can't make or receive calls or texts. I have FULL signal.

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KinquanaH_VZW
Follow us on Twitter @vzwsupport

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Feedback to Apple does not go here, it goes here: www.apple.com/feedback and click on the appropriate link.
This is a user to user forum.

Z1 (Germany) no incoming calls by full signal (LTE, 3G, H+, etc.)

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