Guides & Tutorials
In-depth walkthroughs for API credits, eSIM travel setups and VPN privacy best practices.
How to Test Your eSIM Speed on Arrival (and What the Numbers Mean)
Short answer: run three tests — one at the airport, one at your accommodation, one at a busy outdoor spot — and record download, upload and latency. Healthy travel eSIM numbers are roughly 20–100 Mbps down, 5–30 Mbps up and under 80 ms latency to a nearby server. Lower numbers are not automatically broken; congested […]
API Rate Limits and 429 Errors: Retry, Backoff and Batching
Short answer: a 429 means you hit a limit measured in requests per minute, tokens per minute, or concurrency. Read the Retry-After header, retry with exponential backoff plus jitter, and cap retries. Fixing the architecture — batching, caching, queueing — matters more than tuning the retry loop. What is actually being limited Providers rarely limit […]
Mexico eSIM vs Local SIM in 2026: Cost, Coverage and Speed
Short answer: for a trip under two weeks, a travel eSIM is cheaper and faster to set up than a local SIM; for a stay over a month with heavy data use, a local Telcel or AT&T SIM usually wins on price per gigabyte. Most travellers should start with an eSIM and buy a local […]
WireGuard, OpenVPN or IKEv2: Choosing the Right VPN Protocol in 2026
The Protocol Question Every VPN client eventually asks which protocol to run. WireGuard, OpenVPN, and IKEv2 dominate the landscape, and each makes different trade-offs between speed, compatibility, and how much they resist deep-packet inspection. The right answer depends on the device and the network you are on. WireGuard: The Modern Default WireGuard is a young, […]
Two Numbers, One Phone: Keeping Your Home Line Active While Traveling
The Old Trade-Off Is Gone You used to choose between popping out your home SIM and losing SMS codes, or keeping it in and paying roaming rates. Dual-SIM and multi-eSIM phones removed that choice. You can keep your home number fully active and add a travel data line at the same time. How the Two […]
Function Calling and JSON Mode: Structured Outputs Without the Guesswork
Why Raw Text Outputs Break Pipelines Asking a model to “return JSON” in a prompt is unreliable. It can wrap the answer in markdown, add commentary around it, or invent keys. When your code needs typed data, two mechanisms exist to get it reliably: function calling and structured-output modes like JSON schema. Function Calling in […]
Why Your VPN Feels Slow, and What Actually Fixes It
The Speed Test Trap Everyone runs a speed test, sees a drop, and blames the VPN. Often the real bottleneck is nothing to do with the tunnel protocol. Before you switch providers, work through the usual suspects in order. 1. Server Distance and Load The single biggest factor is physical distance between you and the […]
Cruise Connectivity in 2026: eSIM, Roaming and Satellite Options at Sea
Why Cruises Are a Connectivity Puzzle A cruise ship is not a fixed location, so the normal country-by-country eSIM logic does not apply. Once you are more than a few miles offshore, you are outside coastal cell towers and dependent on the ship’s own systems. Knowing the three available paths makes the difference between a […]
Split Tunneling in Practice: Route Only the Apps That Actually Need a VPN
Why Route Everything? By default a VPN sends all your traffic through the tunnel. That is simple and secure, but it costs you speed, bandwidth, and battery, and it can break local services like a printer or a smart home hub that expects to talk to your phone on the LAN. What Split Tunneling Lets […]
eSIM Security Checklist: Protect Your Data Before and During a Trip
eSIMs Are Safer, but Not Automatic An eSIM removes the risk of losing a physical card and makes your data profile harder to clone, but the phone around it still needs the same hygiene you would use at home. This checklist covers what to do before you fly and while you are abroad. Before You […]