Quick Charge. People want their phones to top up from dead in less than an hour. Forcing that much current into a lithium-ion battery isn't a good idea.
The solution? Make them take longer to charge. Puts less stress on a battery that's made out of volatile materials. Stop trying to appease impatient braindead idiots that want a design feature that's inherently incompatible with safety w.r.t. current manufacturing materials for batteries.
It's been known for several decades now that charging a lithium-ion cell too quickly = ALLAHU AKBAR!, yet people still want it, why? Because they choose to smoke weed and get pregnant instead of paying attention in high school chemistry class, and grow up to be fucking idiots.
...is xhtml.weather.com. A long time ago I had a 30MB data plan and this was one of a few websites that continued to work after running out of data and getting paywalled, although most of the graphical assets were stored on a different domain and thus didn't load post-data bucket depletion. m.us.yahoo.com also used to work, but that was plugged in 2014.
TCP port 53 used to also be wide open, but from what I gathered on various forums, that was patched during the last major VoLTE outage. Two other users commented elsewhere on this story that this port (and it's UDP counterpart) as apparently still open on Verizon Wireless. However, I'm unable to confirm this paragraph.
Well, from a customer-facing perspective, speed tests on unactivated SIMs would be useful for determining what one can realistically expect for network speeds at a given location/time. A very minute "try before you buy".
Due to the way GSM/UMTS/LTE networks perform, there's no performance gains to be had in unconditional whitelisting of speedtests, since the air interface (wireless last mile) will ALWAYS be the primary bottleneck.
That whitelisting for speedtests also applies to unactivated SIMs and prepaid SIMs without active service (e.g. due to nonpayment or zero balance.)
I used to keep a spare phone lying about with an unactivated SIM while I had a prepaid SIM, and discovered the speedtest whitelisting was unconditional. I never thought to dig any deeper into it, although I suspected this type of thing was possible all along.
Glad to have my suspicions confirmed without having to risk my ass.
No extensible language will be universal. -- T. Cheatham