While major mobile networks like Grameenphone and Robi offer extensive coverage across Bangladesh, connectivity in very remote or challenging terrain, such as parts of the Chittagong Hill Tracts or the Sundarbans, can be intermittent.
Even with dominant providers, signal strength can be weak or unavailable in very isolated villages, dense forests, or mountainous areas. While the network infrastructure is continually improving, travelers should anticipate potential dead zones in the most rugged or undeveloped parts of the country. Your eSIM will automatically connect to the strongest available major network, and the exact network can vary by plan, but consistent high-speed data isn't guaranteed everywhere.
For critical navigation or communication, it's highly recommended to download offline maps, important documents, and any necessary entertainment before venturing into these less connected regions.