Isatphone monthly satellite phone plan
Isatphone monthly satellite phone plan Inmarsat IsatPhone Plans SIM Card

IsatPhone Monthly Airtime Plan - SIM Card

As Low As $34.95/Month Requires one-time $25 activation fee
In stock

The IsatPhone Monthly Plan includes 10 minutes of airtime each month, no long-term contracts, free voicemail and call display, free incoming calls and texts, and near global voice and data coverage via the Inmarsat network.

With an IsatPhone monthly plan from Roadpost you’ll enjoy true pay-as-you-go monthly service that you can change or cancel any time, online access to check airtime usage whenever you want, and exclusive rollover bundles.


  • 10 minutes of airtime included each month
  • True pay-as-you-go monthly service with no annual contract
  • Rollover bundles allow unused minutes to carry forward for up to one (1) year (optional)
  • FREE voicemail and call display
  • Convenient access to check airtime usage online
  • Near global coverage (excluding the polar regions)
1 x IsatPhone 10 Minute Monthly Plan   + $34.95 /Month
One Time Activation Fee   + $25.00


Manage Airtime Online

Manage Airtime Online

Your Roadpost account gives you 24/7 access to manage your monthly airtime online:

Check usage of airtime included with your plan

Add options like a US Phone Number, voicemail, or airtime bundles*

View your plans by phone number or plan name

Contact us anytime to change/cancel your plan

Coverage Map

Inmarsat logo

Inmarsat Coverage Map

Inmarsat has you covered almost everywhere

Inmarsat uses three geostationary satellites to provide coverage almost anywhere. Each covers up to one-third of the Earth’s surface, and coverage extends from latitudes* of approximately -82° to 82°.

Learn more
Inmarsat Coverage Map

Detailed Terms

IsatPhone Monthly Service Terms & Conditions

Hidden costs aren’t fun. We believe in giving you all the details.

  • Initial one time activation fee applies
  • Plans auto-renew month-to-month until cancelled or changed
  • Cancellations on month-to-month subscriptions are billed to end of your current monthly bill cycle date.
  • No cancellation penalties or hidden fees after the initial 30-day minimum term. (Note: Some vendors claim to offer monthly plans but in fact require 3-12 month contracts, and charge penalties for early termination.)
  • Unused included airtime does not carry forward month-to-month
  • Airtime is billed with a one minute minimum increment
  • SMS/text messages are billed per message
  • Calls to check voicemail are considered outgoing calls
  • Additional usage will be billed at the standard airtime rates
  • Roadpost Standard Terms and Conditions apply

Optional Airtime Roll-Over Bundle Details

  • The following call types cannot be applied towards your airtime bundle: Outgoing SMS/text messages, IsatPhone to other satellite networks and IsatPhone data
  • Unused airtime does carry forward month-to-month for up to 12 months
  • Minutes for IsatPhone postpaid plans are not pooled/shareable
  • Additional usage not covered by your airtime bundle is billed at the standard airtime rates for the Basic subscription

Airtime Burn Rates

Inmarsat IsatPhone Airtime Rates

Type Rate
Landline/cellular FREE
Landline or cellular $0.99/Min
Voicemail retrieval $0.99/Min
Other IsatPhone $0.99/Min
Text messages $0.49/Msg
Other satellite network $6.95/Min
Data calls $0.99/Min
Other Inmarsat $0.99/Min