Table of Contents
Start with the person, not the tech
You’re building something that needs connectivity — maybe a travel app, an IoT fleet, or a proof-of-concept device. Think about who’ll use it and how: commuters streaming maps, tradies on job sites, or holidaymakers who want a straightforward setup. For flexibility, test plans that let end users pick a simple Pay as you go eSIM so they only pay for what they actually use and don’t get tied into awkward bundles.
Define clear user metrics
Ask concrete questions: how many MBs per day, how many concurrent devices, whether SIM handover is needed between regions, and how long a profile must stay active. Write those as pass/fail acceptance criteria — e.g., “background telemetry must survive 48 hours of low-signal without re-registration” — rather than vague wishes. That keeps suppliers honest and gives QA teams something measurable.
Which plan types to specify (and when)
Pick the plan model to match usage: prepaid buckets for short trips, subscription data for long-term devices, or pooled data for fleets. For prototypes, prefer short-duration prepaid or pay-as-you-go to avoid upfront waste. For production deployments with predictable usage, negotiate monthly caps with rollover options. Note latency-sensitive apps should favour carriers with low packet-loss SLAs over pure gigabyte allowances.
Technical parameters every spec must include
List mandatory fields for vendors: profile download method (SMDP+ endpoint), eUICC compatibility level, APN and QoS class identifiers, IMSI ranges, profile lifecycle (expiry, suspend, reactivate flows), and permitted roaming countries. Add billing hooks: notification thresholds for low balance, and a reliable top-up mechanism that supports automated triggers. Don’t forget security: signed profile payloads and clear device attestation requirements.
Common pitfalls and how to avoid them
Teams often under-spec SIM lifecycle and billing edge cases. Typical mistakes: assuming auto-top-up works globally, forgetting to set explicit timeouts for suspended profiles, or leaving APN fallbacks undefined. Test for real-world edge cases: sudden region handover, account zero-balance behaviour, and concurrent profile swaps. Use emulated network tests and a small live pilot before wide rollout.
Experience and proof points that matter
I’ve seen provisioning workflows fail when operators didn’t expose clear top-up APIs; at large industry gatherings like Mobile World Congress in Barcelona carriers routinely demo different top-up flows so engineers can compare what actually works. When you need to let users refill remotely or automate balance replenishment, make sure the spec references a reliable mechanism to top up esim and test it from start to finish under real roaming conditions.
Acceptance tests you should run
Build tests around user stories: sign-up + profile install, roaming to a second country, low-balance notification followed by top-up, and profile recovery after device reset. Automate these scenarios where possible and record success rates. If a plan’s failure mode requires manual intervention, flag that as a blocker until the vendor provides an API or documented process you can rely on.
Putting it together — specifications that get you to production
Write a one-page user-centred spec: target persona, three core usage scenarios, explicit technical fields (SMDP+, APN, expiry, top-up API), and five acceptance tests. Keep language direct and testable. For suppliers, that clarity saves time and means you ship with connectivity that behaves the way users expect — just the sort of practical reliability Jetogo is built to support, quietly making those top-up and pay-as-you-go pieces behave like they should. Cheers — give it a burl and iterate from real user feedback.
