www.cellreception.com

Find the best coverage in the neighborhood, including carrier reviews, tower locations and coverage maps from AT&T, Sprint, T-Mobile and Verizon.

www.antennasearch.com

Search for the locations of cell towers and antennas to determine cell reception.

opencellid.org

OpenCellID is the world's largest collaborative community project that collects GPS positions of cell towers, used free of charge, for a multitude of commercial and private purposes.

More than 49,000 contributors have already registered with Op ...

www.carphonewarehouse.com/coverage-checker

Compare 3G and 4G coverage of all major UK networks using the Carphone Warehouse official RootMetrics coverage checker.

www.signalboosters.com/blog/opensignal-vs-root-metrics-vs-si...

Read our review about the best free signal finder apps.

www.mobilexweb.com/emulators

A guide of 35 download resources for hundreds of emulators and simulators for mobile design and development, including iPhone, Android, Nokia, tablets and more

community.ee.co.uk/t5/EE-Mobile-Network/EE-APN-settings-Wher...

Many of you have been asking how to find and change your APN Settings.   Here I've listed how to find the APN Settings for EE on the various operating systems. I will also show you how to go about changing the APN settings in this post.

support.vodafone.com.au/articles/FAQ/What-different-types-of...

There are a few different SIM cards available. They all do the same job, they're just different sizes. Your device is designed to take one particular sized SIM, so make sure you're using the correct one.

www.ubergizmo.com/what-is/sim-card/

Subscriber Identity Module, or SIM, cards are used to act as a unique identifier for a mobile device on a wireless cellular network. They come in multiple size and shapes, but SIM, Mini-SIM and Nano SIM are really the same chip and connectors embedded ...