gprs setup

* tying 'key' to ground turns on gprs at startup, took out line complaining about
  the power button
* added wwan to blacklist to get ride of wwan issues and took out line complaining
  about wwan0 showing up

experiment/production/GPRS-GPS-notes.md

@@ -73,6 +73,26 @@ AT
 
 ---
 
+I was having trouble with a `wwan0` interface coming up.
+To have it automatically not show up:
+
+```
+sudo bash
+
+cat >> /etc/modprobe.d/raspi-blacklist.conf <<EOF
+blacklist qmi_wwan
+blacklist cdc_wdm
+EOF
+
+# have changes take effect
+#
+shutdown -r now
+```
+
+([src](https://sixfab.com/forums/topic/how-to-remove-interface-wwan0/)
+
+---
+
 To setup a `ppp` connection, issuing:
 
 ```
@@ -83,12 +103,6 @@ as root should work.
 
 If there are troubles, look at `dmesg` and `/var/log/syslog` for clues as to what went wrong.
 
----
-
-* After setup, I'm having trouble with `wwan0`. Doing `ifconfig wwan0 down` and then resetting the `ppp` connection
-  (`poff fona ; pon fona`), I get internet connectivity.
-* I have to physically hold down the 'on' button for 5s to turn on the GPRS and GPS functionality
-
 GPS
 ---