your Telus iphone miss calls ?
Due to the nature of the continuous Telus network upgrades, it has arisen that all hardware and ios versions of iphone can and are, experiencing missed calls. However, there is no correlation as to why some units are worse than others.
First, I will briefly describe the cause and then two quick tests that can lead to an acceptable fix.
The Telus cellular network comprises numerous frequency bands (600, 700, 850, 1900, 1700/2100, 2300, & 2600 MHz) and two transmission protocols (3G HSPA & 4G LTE). 3G HSPA includes standard channelized voice calls and data capability up to about a 20 meg speed, but only the 850 & 1900 MHz bands. LTE is data only with speeds up to 120 meg (in bands 1900, 1700/2100, 2300, 2600 MHz) and up to 20 meg on the 600, 700, 850 MHz bands. If the phone is set to LTE mode, it constantly monitors both the 3G HSPA and 4G LTE signals but only displays the 4G LTE signal strength. When a call is made or one comes in, the phone will switch to the 3G HSPA network to process the call. However, iphones for some reason, get locked in LTE and then don't switch to 3G HSPA when a call comes in, hence missing the call.
Here are some simple tests to try . . .
(1a) With the phone set to LTE (data only option), check the signal strength. It'll show bars and LTE. Now make a call and watch the signal indicator. The bars will change and it will show something like 3G, HSPA, H, H+. This is showing the phone is switching properly from 4G to 3G during a voice call.
(1b) One solution then, is to turn LTE off in the settings and keep the phone in 3G mode all the time.
(2a) Another solution is to turn voice over LTE (VoLTE) calling on. This is basically like VOIP for a landline but on cellular. In the settings, turn LTE on, and select the voice and data option. However, this option must also be turned on at the system level for your phone number. A call to Telus and the CSR can verify if it is on or turn it on. If you turn this setting on and make a call, and the signal indicator changes to 3G as in test (1a), then the feature is not turned on on your account. You'll know this feature is on and working properly when, during a call, the signal indicator stays showing LTE.
(2b) The second solution then is to use VoLTE calling.
Advantages of turning LTE off . . .
As you increase in frequency from the 600 MHz band to the 2600 MHz, two things happen. One, the higher the frequency, the less distance the signal travels from the tower for the same power output (and also worse building penetration). And two, the higher the frequency, the greater the bandwidth for more and faster data throughput.
So there's a trade-off, the higher the frequency band, the higher the data speed, but the poorer the signal. Or, the lower the frequency band, the better the signal, but the slower the data speed.
3G HSPA voice and data only exists in the 850 and 1900 MHz bands. These frequency bands have good signal, but 3G has slower data (up to 20 meg speed).
Those that rely primarily on voice communications and use only basic data services like email or social media updates will never notice the speed difference but will benefit from reliable 3G voice calling.