I've noticed that, somewhat often out of the blue, my N9 will appear to have reception and a 3.5G connection displayed in the status bar but actually is not receiving calls or texts. When it's like this, I can only tell if this happens when I try to make a call and get a message that it fails or if I reboot the phone and get bombarded by texts or voicemails I was waiting for.

I did a brief search but didn't get any results, maybe I am using the wrong terms. Any idea what causes this and what steps I can take to identify/fix this?

Additionally, the phone tends to be very slow at loading webpages and 40% of the time will fail to load it in comparison to a Lumia 521 and an iPhone 4 which work acceptably when tried in the same room. I am on T-Mobile USA and the iPhone does not even have the 1700mhz HSPDA band, which makes me wonder what to do.

Would really appreciate some help, if I can't get a handle on this I'm going to have to stick to the iPhone.