Yes, travelers can generally access the internet and communication services quite easily in Indonesia. Here are some key points:

1. Mobile Networks: Indonesia has a well-developed mobile network infrastructure, with several major telecommunications providers offering 4G and even 5G services in urban areas and many parts of the country. This allows travelers to stay connected via their smartphones or other mobile devices.

2. SIM Cards: It's relatively easy for travelers to purchase prepaid SIM cards upon arrival in Indonesia. These SIM cards are available at airports, convenience stores, and mobile network provider outlets. They usually offer data packages along with calling and texting services, enabling tourists to access the internet during their stay.

3. Wi-Fi: Many hotels, cafes, restaurants, and public spaces in tourist areas offer Wi-Fi access to their customers. While the quality and speed of Wi-Fi may vary, it's generally available in urban centers and popular tourist destinations.

4. Internet Cafes: Although less common than in the past, internet cafes still exist in Indonesia, particularly in smaller towns and cities. Travelers can use these facilities to access the internet and communication services if they don't have their own devices.

5. Internet Access in Remote Areas: In more remote or rural areas of Indonesia, internet access may be limited or unavailable, and mobile network coverage could be weaker. Travelers should be prepared for potential connectivity challenges when visiting such areas.

6. Communication Apps: Messaging and communication apps like WhatsApp, Telegram, and Facebook Messenger are widely used in Indonesia and can be accessed over mobile data or Wi-Fi connections. These apps are convenient for staying in touch with friends, family, and fellow travelers.