Telephone companies operating in the municipality includes TELECOM, Globelines and Bayantel.
Smart and Globe cellular phone companies are also operational.
The town also has a local radio station, Radyo Natin Guiuan (103.7 MHz), serving Guiuan and neighboring areas in Eastern Visayas.

In 2004, Eastern Samar Electric Cooperative (ESAMELCO) was able to energize Guiuan, Calicoan Island up to Sulangan covering 37 out of 60 barangays.
Island barangays are served with electricity through generator sets either privately owned or operated by the barangay council.
However, electricity shortages are frequent and subscribers experience weekly power failures, lasting for 10 to 12 hours or for 24 hours in severe cases.

Guiuan is also the site of one of the weather stations of the Philippine Atmospheric, Geophysical and Astronomical Services Administration, located in Barangay Sapao.
Positioned at 60 metres (200 ft) above sea level, the facility consists of a Surface Synoptic Station for usual weather observation and a Doppler weather radar station for detecting intensity (reflectivity) and velocity (by Doppler effect) of distant weather elements.
The radar station was built and renovated with the aid of the Japan International Cooperation Agency (JICA).
Telephone companies operating in the municipality includes TELECOM, Globelines and Bayantel. Smart and Globe cellular phone companies are also operational. The town also has a local radio station, Radyo Natin Guiuan (103.7 MHz), serving Guiuan and neighboring areas in Eastern Visayas.
In 2004, Eastern Samar Electric Cooperative (ESAMELCO) was able to energize Guiuan, Calicoan Island up to Sulangan covering 37 out of 60 barangays. Island barangays are served with electricity through generator sets either privately owned or operated by the barangay council. However, electricity shortages are frequent and subscribers experience weekly power failures, lasting for 10 to 12 hours or for 24 hours in severe cases.
Guiuan is also the site of one of the weather stations of the Philippine Atmospheric, Geophysical and Astronomical Services Administration, located in Barangay Sapao. Positioned at 60 metres (200 ft) above sea level, the facility consists of a Surface Synoptic Station for usual weather observation and a Doppler weather radar station for detecting intensity (reflectivity) and velocity (by Doppler effect) of distant weather elements. The radar station was built and renovated with the aid of the Japan International Cooperation Agency (JICA).
Guiuan