There is nothing worse than watching your Safaricom line drop to zero units in the middle of an urgent call or while waiting for an important message.

The fastest fix: Paybill 4142145 can have airtime back on your line in well under a minute, faster in most cases than trying to find someone nearby with float to send you emergency credit.

Step 1: Open your M-Pesa menu and select Lipa na M-Pesa, then Pay Bill.

Step 2: Key in 4142145, TeelPay's official paybill for buying airtime for all networks including Safaricom.

Step 3: Enter the Safaricom number you want to top up as the account number.

Step 4: Type the amount you want to buy, then enter your M-Pesa PIN to confirm.

Step 5: You will get an M-Pesa confirmation SMS almost immediately, followed by a top-up alert from Safaricom itself.

Keeping the paybill number saved as a favourite in your M-Pesa app means you are never more than a few taps away from solving an emergency airtime shortage.

Because the payment runs through Safaricom's official Lipa na M-Pesa Paybill system, it carries the same security as every other M-Pesa transaction you make, complete with a confirmation SMS you can refer back to at any time.

TeelPay exists so that buying airtime for all networks in Kenya, Safaricom included, does not require separate apps, agents or shortcodes. One paybill number, 4142145, covers Safaricom, Airtel, Faiba and Equitel, so you only ever need to remember one number no matter whose line you are topping up.

Kenya's airtime habits have shifted fast: Safaricom lines today are used for far more than calls, they power mobile money, data bundles, USSD banking and countless small daily transactions. Keeping a line active is rarely optional, which is why having more than one reliable way to top up matters, especially one that does not depend on an agent's opening hours or available float.

Save Paybill 4142145 in your M-Pesa favourites, and the next time your Safaricom line runs low on airtime, you will be back online in under a minute, no matter where you are or what time it is.