After adding a Stellar (XLM) wallet from your mobile app, it will be in the disabled (not created on the Stellar network) state.
Due to Stellar's policy, a minimum of 1XLM must be transferred to the Stellar address to activate the account on the Stellar network. Depending on the exchange services, transferring fund to an inactive XLM account address may be restricted.
In addition, 1XLM in the account will be permanently locked-up. For example, if you have 100XLM in your account after creating your wallet, you can only transfer 99XLM (including fee). As shown in the figure, the remaining balance of 1XLM cannot be sent to another account even when if you try to send the maximum amount.