There are many online tools that can be used for that. All you need to do is copy the raw (signed) transaction to your mobile and broadcast it using any of the avaliable tools.
In this way, you don't need to have your private keys in your mobile phone and that's what OP is trying to achieve.

When you increase the fee, the transaction data changes, the signature becomes invalid and it's like that you are making a new transaction. If OP wants to sign the transaction again, he/she would have to get back home as he wouldn't have access to his/her laptop out of the home.

If you lose access to your (non-custodial) wallet or you want to import it somewhere else for any reason, you can use your backup.
People usually use a single-signature wallet with a 12 word seed phrase and that's all they need to recover their wallet.

If you created a m of n multi-signature wallet, there are n seed phrases. For recovering your wallet and spending fund from your wallet, you need m of seed phrases in addition to master public keys derived from the other seed phrases.

A 12 word BIP39 seed phrase is secure enough and since it provides the same security as a private key, you don't really increase your security with increasing the number of words to more than 12.
Also note that the BIP39 wordlist contains 2048 words and it's not that there are hundreds of thousands words used for generating a seed phrase.

Unlike the desktop version of electrum, you can't set the fee rate to any amount you want in the Android version.

If you use statistic method when setting the fee rate, electrum allows you to set the fee rate to 1, 2, 5, 10, 20, 30, 50, .... sat/vbyte.
There are also mempool and ETA methods in which electrum gives you estimations for the fee rate.

Z-tight is right.
There is no coin control in the android version of electrum.
In the android version, we have address freezing, but that's different from coin control.

Sign/verify message is also available only on the desktop version of electrum.

There is no IOS version of electrum.
Electrum is available on Linux, Windows, Android and MacOS.

To OP:
Both wallets that were recommended by Nwada001 are good options and I also recommend them.
Just note that it's not a good idea to keep a big fund on online wallets.

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As already said, a 12 word seed phrase provides 128 bits of entropy and is secure enough.

If you really worry about your security, you shouldn't use trustwallet at all.
Trustwallet is close source and there is no way to know how the keys are generated and whether they have access to the keys or not.


There are many wallets that are better than trustwallet.

A good option is electrum. It's available on Linux, Windows, Android and MacOS.
The desktop version of electrum allow you to generate a 24 word seed phrase through command line in its console. Just note that electrum's seed phrase is not BIP39 and it can be imported only in itself and bluewallet.

If you are on dekstop, you can also use Sparrow. Sparrow allow you to generate a 24 word BIP39 seed phrase easily.

If you are on mobile, you can also use bluewallet and Samourai. Of course, none of these wallets generate 24 word seed phrase.

I don't know any wallet allowing to make the replacement transaction to a different address. So, you are kind of right. It's only electrum that allow you to use the outputs that have been already spent in an RBF-enabled unconfirmed transaction to one of your own addresses. Even electrum doesn't allow you to use any address you want as receiving address in the replacement transaction, however there's a workaround for that.


Charles-Tim is also right.
According to BIP125, the replacement transaction must have at least one same input as the original transaction. It doesn't say anything about outputs. So, you can use any receiving address(es) you want as the receiving address in the replacement transaction. If you can't do so, it's just because your wallet doesn't allow that.

I am not sure I am understanding you correctly. What do you mean by "expected blocks"? Do you mean the block which you expected your transaction to be included in?
If so, note that what shown by some tools are just estimations and it's normal that your transaction is confirmed earlier or later than the estimated block.

Orphan blocks and stale blocks are different from each other, however many people use the terms interchangeably. You can click here to visit an article on Bitcoin Wiki about the difference between orphan blocks and stale blocks.


The image you posted is trying to explain stale blocks.

The image isn't displaying a single chain.
The image is displaying multiple chains. The blocks that are shown in purple have become invalid because the other chain have more work.

There is no such thing as congested blockchain. The blockchain includes confirmed transactions, not the unconfirmed transactions.
Nodes keep unconfirmed transactions in their mempool and it's the mempool that becomes congested and people have to pay higher fees, so that their transaction is prioritized by miners.

Right. There is no way to ask nodes to remove your transaction from their mempool without broadcasting a new transaction which is replaced that.

In the future, whenever you are in hurry, bump the fee. With canceling the transaction and then making a new one, you have to pay more fee and you may even make the situation worse.

There is no need to do so. The root keys generated by the old versions of Armory are supported by the newer versions and they should work.

How did you make your backup? Did you print that or did you write it down manually? If it's the latter, maybe, you made a mistake when writing the root key.

What do you mean by cancelling the transaction? Do you mean you used RBF feature and replaced the transaction with a new one sending the fund to your own address?
If so, take note that with doing so, you waste you money as you have to pay fee for two transactions. You could replace the unconfirmed transaction with a new one paying higher fee.

Anyways, the network is so congested now and as mentioned above by LucyFurr, the fee rate of around 40 sat/vbyte is now required for getting confirmation.
What was the fee rate you used for your transaction?

Where did you get the 0.0001 from? 0.0001 doesn't mean impossible.


A bitcoin private key is just a random number between 0 and around 2²⁵⁶ (not exactly 2²⁵⁶).

For generating a private key, all you need is to generate a random number.
You can use SHA256 or any other function to get a private key from any arbitrary data, but you don't have to do so and that's not a good method at all. As I said, a private key is just a random number.

You can have a 24 word seed phrase, but a 12 word BIP39 seed phrase provides 128 bits of entropy and is secure enough. Even a private key gives you 128 bits of security and as I said that's enough.

Also note that you shouldn't choose a seed phrase. You should generate a random seed phrase and that's surely unique if it's generated in the correct way.

Even now, miners can include transactions paying less than 1 sat/vbyte and there's nothing stopping them from doing that.
According to consensus rules, the total value of outputs must be equal or smaller than the total value of inputs. This means that even if the fee for a transaction is zero, that's not against consensus rules.


That's because nodes usually use the default setting and their minimum relay fee is 1 sat/vbyte.
It's possible that nodes decide to change the minimum relay fee in the future.

Electrum uses a fixed derivation path when generating a seed phrase and that's why you are not asked to enter the derivation path when you recover your wallet using electrum's seed phrase.

You need to know the derivation path when you have a BIP39 seed phrase. Of course, since most wallets use common derivation paths like m/84'/0'/0', m/44'/0'/0' and m/49'/0'/0', you still don't need to save or write down the derivation path.