jm + 3g   13

KillBiller
Excellent mobile-phone plan comparison site for the Irish market, using apps which you install and which analyse your call history, data usage, etc. over the past month to compute the optimal plan based on your usage. Pretty amazing results in my case!

The only downside is the privacy policy, which allows the company to resell your usage data (anonymised, and in aggregate) -- I'd really prefer if this wasn't the case :(
mobile-phones  shopping  tesco  emobile  3g  4g  ireland  plans  comparison-shopping  killbiller  via:its 
may 2015 by jm
"CryptoPhone" claims to detect IMSI catchers in operation
To show what the CryptoPhone can do that less expensive competitors cannot, he points me to a map that he and his customers have created, indicating 17 different phony cell towers known as “interceptors,” detected by the CryptoPhone 500 around the United States during the month of July alone.  Interceptors look to a typical phone like an ordinary tower.  Once the phone connects with the interceptor, a variety of “over-the-air” attacks become possible, from eavesdropping on calls and texts to pushing spyware to the device.

“Interceptor use in the U.S. is much higher than people had anticipated,” Goldsmith says.  “One of our customers took a road trip from Florida to North Carolina and he found 8 different interceptors on that trip.  We even found one at South Point Casino in Las Vegas.”
imsi-catchers  security  cryptophone  phones  mobile  3g  4g  eavesdropping  surveillance 
august 2014 by jm
China detains 1,530 in telecom spam crackdown
via Christopher Soghoian: 'IMSI catchers/fake base stations are out of control in China. The gov shut down 24 IMSI catcher factories, 1500+ people were arrested.'
privacy  spam  china  imsi-catchers  mobile  3g  gsm  phones 
august 2014 by jm
Coding For Life (Battery Life, That Is)
great presentation on Android mobile battery life, and what to avoid
presentations  via:sergio  android  mobile  battery  battery-life  3g  wifi  gprs  hardware 
may 2014 by jm
Flood IO Offering Network Emulation
Performance-testing-as-a-service company Flood.IO now offering emulation of various crappy end-user networks: GSM, DSL, GPRS, 3G, 4G etc. Great idea.
flood.io  performance  networking  internet  load-testing  testing  jmeter  gatling  tests  gsm  3g  mobile  simulation 
april 2014 by jm
Uplink Latency of WiFi and 4G Networks
It's high. Wifi in particular shows high variability and long latency tails
wifi  3g  4g  mobile  networking  internet  latency  tcp 
april 2014 by jm
193_Cellxion_Brochure_UGX Series 330
The Cellxion UGX Series 330 is a 'transportable Dual GSM/Triple UMTS Firewall and Analysis Tool' -- ie. an IMSI catcher in a briefcase, capable of catching IMSI/IMEIs in 3G. It even supports configurable signal strength. Made in the UK
cellxion  imsi-catchers  imei  surveillance  gsocgate  gsm  3g  mobile-phones  security  spying 
february 2014 by jm
Packet Flight: Facebook News Feed @8X
good dataviz of a HTTP page load: 'this is a visualization of a Facebook News Feed load from the perspective of the client, over a 3G wireless connection. Different packet types have different shapes and colors.' (via John Harrington)
via:johnharrington  visualization  facebook  dataviz  networking  tcp  3g 
january 2014 by jm
"High Performance Browser Networking", by Ilya Grigorik, read online for free
Wow, this looks excellent. A must-read for people working on systems with high-volume, low-latency phone-to-server communications -- and free!
How prepared are you to build fast and efficient web applications? This eloquent book provides what every web developer should know about the network, from fundamental limitations that affect performance to major innovations for building even more powerful browser applications—including HTTP 2.0 and XHR improvements, Server-Sent Events (SSE), WebSocket, and WebRTC.

Author Ilya Grigorik, a web performance engineer at Google, demonstrates performance optimization best practices for TCP, UDP, and TLS protocols, and explains unique wireless and mobile network optimization requirements. You’ll then dive into performance characteristics of technologies such as HTTP 2.0, client-side network scripting with XHR, real-time streaming with SSE and WebSocket, and P2P communication with WebRTC.

Deliver optimal TCP, UDP, and TLS performance;
Optimize network performance over 3G/4G mobile networks;
Develop fast and energy-efficient mobile applications;
Address bottlenecks in HTTP 1.x and other browser protocols;
Plan for and deliver the best HTTP 2.0 performance;
Enable efficient real-time streaming in the browser;
Create efficient peer-to-peer videoconferencing and low-latency applications with real-time WebRTC transports


Via Eoin Brazil.
book  browser  networking  performance  phones  mobile  3g  4g  hsdpa  http  udp  tls  ssl  latency  webrtc  websockets  ebooks  via:eoin-brazil  google  http2  sse  xhr  ilya-grigorik 
october 2013 by jm
Breaking the 1000 ms Time to Glass Mobile Barrier [slides]
Great presentation from Google on HTML5 CSS+JS render speed, 3G/4G network latency, etc. (via John G)
google  slides  3g  4g  lte  networking  telcos  telecom  css  js  html5  web  via:jg  mobile 
april 2013 by jm
nifty Cydia iPhone signal-strength app
very nifty. pity my phone's not jailbroken, or I'd be trying this out
jailbreaking  cydia  iphone  signal-strength  3g  wireless  mapping 
august 2011 by jm
Tethering with your O2.ie iPhone
well done O2, you've made it insanely complicated and marginally useless
tethering  iphone  o2  ireland  wireless  3g  tariffs  telco  from delicious
february 2010 by jm

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