How to Use Across Bridge on Mobile
Across Bridge is a practical option when you want to move crypto from one chain to another on your phone without turning the process into a desktop-only project. If you are using a mobile wallet and need to move funds between Ethereum, Arbitrum, Optimism, Base, Polygon, zkSync, or another supported L2, Across Bridge helps make that flow feel simpler.
The main problem on mobile is not just speed. It is attention. You are working on a smaller screen, switching between wallet prompts, chain selectors, gas warnings, and confirmation screens. One wrong tap can send funds to the wrong destination chain or leave you without enough gas to use the funds when they arrive.
This guide walks through the mobile process clearly: what to prepare, what each step means, and where to slow down before signing. Across is an intents-based cross-chain bridge, so the transfer experience is different from an old-style bridge that makes you wait through a slow lock-and-mint flow. You still need to check details, but you do not need to guess what is happening behind the scenes.
What You'll Need Before Using Across Bridge
Set these up before you start. It prevents most mobile bridging mistakes.
- A non-custodial wallet, such as MetaMask, installed on your phone.
- The source chain where your funds currently are.
- The destination chain where you want the funds to arrive.
- The token you want to bridge.
- A little crypto for gas on the source chain.
- Enough awareness of the destination chain to know what you will do after the transfer lands.
Gas matters on mobile because wallet screens often compress important details. You may see a bridge fee, a network gas fee, and sometimes a reminder that you need gas on the destination chain too. Do not treat those as background noise. If the transfer arrives on Base, Arbitrum, Optimism, Polygon, or zkSync but you have no gas there, you may not be able to move or use the funds until you add some.
How Across Bridge Works on Mobile
Across is a bridge, not a swap AMM. You are not trading through a pool in the same way you would on a decentralized exchange. You are asking to move assets cross-chain.
The short version is this: you deposit on the source chain, a relayer quickly fills the request on the destination chain, and the relayer is later reimbursed after optimistic settlement. That relayer fill is why transfers can feel fast from a user's point of view.
This intents-based design is useful on mobile because you care about a clean result: funds leaving one chain and appearing on another with fewer steps. But it does not remove responsibility. You still need the right token, the right destination chain, and a wallet you control.
Step 1: Open Across Bridge in Your Mobile Browser
Use your phone's browser or the browser built into your wallet app. If you are using MetaMask mobile, the in-app browser can be convenient because wallet connection and transaction signing happen in the same app.
Before connecting, make sure you are on the official front-end you intended to use. Mobile search results, ads, and copied links can be messy. A fake front-end can imitate a real bridge page and trick you into signing something you do not understand.
Once you are ready, open Across Bridge and prepare to connect your wallet.
Step 2: Connect Your Wallet
Tap the wallet connection button and choose your mobile wallet. Your wallet may ask which account to connect. Pick the account that holds the funds you want to bridge.
After connecting, check the visible wallet address. On mobile, it is easy to connect the wrong account if you use more than one. If the balance looks wrong, stop and switch accounts before continuing.
Also check the active network in your wallet. If your token is on Arbitrum but your wallet is currently showing Ethereum, you may need to switch networks before the bridge can detect the correct balance.
Step 3: Pick the Source and Destination Chains
Choose the chain you are sending from first. This is the source chain. Then choose the chain you want to receive funds on. This is the destination chain.
Slow down here. This is the most important part of the whole mobile flow. Ethereum to Base is not the same as Base to Ethereum. Optimism to Arbitrum is not the same as Arbitrum to Optimism. If your app, exchange, or NFT marketplace expects funds on a specific chain, match that chain exactly.
This is also where you should think about whether a canonical bridge is a better fit for your situation. Canonical bridges are usually the official bridge routes for a given chain, while Across focuses on fast cross-chain transfers through relayers and optimistic settlement. For many everyday transfers, Across is built for speed and simplicity. For unusual assets or very specific protocol requirements, confirm that the destination asset is the one you actually need.
Step 4: Choose the Token and Amount
Select the token you want to bridge, then enter the amount. Keep a small amount behind for gas. Do not bridge your entire source-chain balance unless you are certain the wallet will still have enough to pay transaction costs.
Review the fee information before continuing. A bridge fee and gas fee are not the same thing. The bridge fee relates to the cross-chain transfer service and liquidity. Gas is paid to the blockchain network for processing transactions. These amounts can change with network demand.
If you are new, start with a modest amount. For example, you might test a small transfer before moving a larger balance. That is only an illustrative example, not a rule, but it is a good habit when you are learning a new route.
Step 5: Review the Mobile Confirmation Screen
Before you sign, read the summary:
Mobile wallet prompts can hide details behind expandable sections. Open them if something feels unclear. If the wallet asks for an approval before the bridge transaction, that usually means you are allowing the bridge contract to use a certain token amount. After approval, you may need to confirm the actual bridge transaction separately.
Do not rush just because the interface looks familiar. A bridge transaction moves value between environments. Treat the confirmation like a banking action, not a notification pop-up.
Step 6: Wait for the Fill and Check the Destination Chain
After you confirm, Across relayers work to fill your transfer on the destination chain. The exact wait can vary, so avoid assuming a guaranteed time. Mobile connections, network congestion, wallet refresh delays, and chain conditions can all affect what you see.
When the transfer is filled, switch your wallet to the destination chain and check the token balance. If you do not see the token immediately, make sure you are viewing the correct network and token. Some wallets need you to manually import a token display before the balance appears.
The important point: the funds should be checked on the destination chain, not the source chain. If you bridged to Polygon, look on Polygon. If you bridged to Base, look on Base.
Common Mobile Mistakes That Cost People Money
The biggest mistake is choosing the wrong destination chain. If an app requires funds on Optimism and you send them to Arbitrum, the transfer may have worked technically, but it did not solve your actual problem.
Another common mistake is picking the wrong token. Similar tickers can exist across chains, and not every version of a token behaves the same inside every app. Check what the receiving app or wallet expects.
People also ignore fees. If the received amount is lower than expected, it may be because the bridge fee, gas, or liquidity conditions changed the final amount. Review before signing.
Unofficial front-ends are another risk. Use the site you intended to use, avoid random links, and be suspicious of urgent prompts. A real bridge transaction should be understandable before you approve it.
Finally, remember smart-contract risk. Across is designed as a cross-chain bridge with relayers and optimistic settlement, but no bridge should be treated as risk-free. Wrong-chain transfers, wallet mistakes, fee changes, and contract risk are part of using crypto infrastructure.
Use Across Bridge Carefully From Your Phone
Using Across Bridge on mobile comes down to a simple rhythm: connect the right wallet, choose the correct source and destination chains, check the token and amount, review fees, sign only what you understand, then verify funds on the destination chain.
The mobile experience can be fast, but the best users still slow down at the confirmation screen. For a clean cross-chain transfer flow, open Across Bridge, review every field, and bridge only when the destination chain, token, amount, and fees all match what you intended.