Hey Rmitch!
The phone is compatible with our network. 
Have you tried to reset the network settings?
If you put your SIM card back into your iPhone 6 Plus, are you currently experiencing similar difficulties maintaining your connection to LTE?
Hello Rmitch,
Firstly, I'll assume you purchased your phone from a Canadian Apple store. That is, your phone model is the A1901. Yes, it would have all of the compatible bands/frequencies. You can verify the compatible bands/frequencies here.
Are you having the issue of dropped LTE signal everywhere or only at some locations? It's possible that your location has a relatively weak Fido/Rogers LTE signal. I understand your old iPhone 6+ had no issues at your location. However, starting with the iPhone 7's, Apple has decided to use two different modems in their devices, depending on target markets -- one from Qualcomm; the other Intel (see here). Unfortunately, the Canadian version gets the inferior cellular modem, which means more dropped calls, worse reception, and lower data rates.
I also understand your phone has no issues staying connected to the VM LTE network. It's possible that Bell/Telus have a tower with LTE closer to your location providing a stronger signal to your phone. That's not to say that they have a better network. The mobile providers have their cellular towers strategically placed. Some areas might be better covered by Bell/Telus; some areas are better covered by Rogers. It all depends on the particular circumstances of a given area. It's a common misconception that any mobile provider will work for everyone. For example, I was intending on switching my mother from Rogers prepaid to Telus prepaid. However, her phone (unlocked) did not receive any signal when I put in a Telus SIM at her location and she lives in a medium-sized city. I ended up switching her to an alternate provider using Rogers' network. You can get an idea of your local cellular towers here.
The different coverage areas is the basis for extended coverage. However in your case, since your phone can access the '3G' network, it's likely it won't be able to access Fido-EXT at that location.
I also understand that your phone has no problem connecting to '3G'. If what I suggest is true, it's likely your phone is able to connect to that network is because the lower frequencies used can travel farther and have greater penetrability than those used on the LTE network (with the exception of bands 12 & 17 or 700MHz; see graphic here).
Are there any places where your phone does not drop LTE signal?
If this scenario proves to be the reason, unfortunately there is not much that can done to solve the issue. One possibility would be to get a signal booster for your location.
Hope this helps
Cheers
Hello again,
Thanks for the additional information!
Rmitch wrote:.. That model is not A1901 but MQAC2VC.....
Just to clarify, the MQAC2VC is the manufacturer part number signifying the colour and size of memory (see here). The model of the phone is A1901 (see here). While that page does not specifically note the Canadian part numbers, I think it is rather clear that MQAC2VC is a manufacturer part number and the Canadian model is A1901.
Hopefully a new phone will solve your problem
Cheers
